Pinched this idea from the former BBC boards

[Najemikon]

"Can't tell ya"... 

1. Panic Room (it had a panic room. Surprsingly.)
2. Batman movies (Bat Cave)
3. Dawn of the Dead (they build a wall to make that upstairs hideout "secret")
4. Young Frankenstein (Put the candle back!)
5. Harry Potter and the Order of the Phoenix (Room of Requirements)
6. Perfect Stranger (Giovanni Ribisi's secret room) {great film if anyone hasn't seen it yet}
7. The Silence of the Lambs
8. Hostage (kid has turned the wall cavity into a den)
9. The Santa Clause (Santa's workshop)
10. Burglar (Whoopi's safe room in her apartment)
11. The General's Daughter (where she did all her...um...off-duty stuff   )
12. Inside Man (Can't tell ya.)
13. Aliens (Newt's hidey-hole)

[DJ Doena]

1. Panic Room (it had a panic room. Surprsingly.)
2. Batman movies (Bat Cave)
3. Dawn of the Dead (they build a wall to make that upstairs hideout "secret")
4. Young Frankenstein (Put the candle back!)
5. Harry Potter and the Order of the Phoenix (Room of Requirements)
6. Perfect Stranger (Giovanni Ribisi's secret room) {great film if anyone hasn't seen it yet}
7. The Silence of the Lambs
8. Hostage (kid has turned the wall cavity into a den)
9. The Santa Clause (Santa's workshop)
10. Burglar (Whoopi's safe room in her apartment)
11. The General's Daughter (where she did all her...um...off-duty stuff  )
12. Inside Man (Can't tell ya.)
13. Pulp Fiction (the S&M room beneath the store)

[richierich]

1. Panic Room (it had a panic room. Surprsingly.)
2. Batman movies (Bat Cave)
3. Dawn of the Dead (they build a wall to make that upstairs hideout "secret")
4. Young Frankenstein (Put the candle back!)
5. Harry Potter and the Order of the Phoenix (Room of Requirements)
6. Perfect Stranger (Giovanni Ribisi's secret room) {great film if anyone hasn't seen it yet}
7. The Silence of the Lambs
8. Hostage (kid has turned the wall cavity into a den)
9. The Santa Clause (Santa's workshop)
10. Burglar (Whoopi's safe room in her apartment)
11. The General's Daughter (where she did all her...um...off-duty stuff   )
12. Inside Man (Can't tell ya.)
13. Pulp Fiction (the S&M room beneath the store)
14. Aliens (Newt's Hidey-hole)
15. Santa Clause 3 - snow globe room 

[Kathy]

richierich...and the new topic is?...

[richierich]

Name 15 films where the director has appeared in a cameo role.....

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)

[ninehours]

Name 15 films where the director has appeared in a cameo role.....

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)

[DJ Doena]

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)
3. Peter Jackson - Lord of the Rings (towner in FOTR, archer in TTT, pirate in ROTK)

[Jimmy]

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)
3. Peter Jackson - Lord of the Rings (towner in FOTR, archer in TTT, pirate in ROTK)
4. Lucio Fulci - Perversion Story (The graphologist)
5. Phillip Noyce - The Bone Collector (Antique Bookshop Customer)
6. George Romero - The Crazies (Mayor of Evans City)

I am right on this : a cameo is uncredited? Can we use voice cameo?

[DVDsRGreat]

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)
3. Peter Jackson - Lord of the Rings (towner in FOTR, archer in TTT, pirate in ROTK)
4. Lucio Fulci - Perversion Story (The graphologist)
5. Phillip Noyce - The Bone Collector (Antique Bookshop Customer)
6. George Romero - The Crazies (Mayor of Evans City)
7. M. Night Shyamalan - The Village (Guard at desk)
8. M. Night Shyamalan - Unbreakable (Stadium Drug Dealer)
9. M. Night Shyamalan - The Sixth Sense (Dr. Hill) - OK I cheated a bit on these 3 (I knew he was there in a cameo role but didn't know the actual part) 

[Najemikon]

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)
3. Peter Jackson - Lord of the Rings (towner in FOTR, archer in TTT, pirate in ROTK)
4. Lucio Fulci - Perversion Story (The graphologist)
5. Phillip Noyce - The Bone Collector (Antique Bookshop Customer)
6. George Romero - The Crazies (Mayor of Evans City)
7. M. Night Shyamalan - The Village (Guard at desk)
8. M. Night Shyamalan - Unbreakable (Stadium Drug Dealer)
9. M. Night Shyamalan - The Sixth Sense (Dr. Hill)
10. Peter Jackson - The Frighteners (punk who bumps into Fox)

I was going to protest my innocence for daring to suggest a director who'd already been listed, before I noticed Shyamalan's entire back catalogue!

I was going to suggest that Spielberg had a cameo in Duel. You can see him on the back seat of the car... I don't think it was intended though!

And yes, I think a cameo should be uncredited. Otherwise I bagsy Braveheart!

[lovemunkey187]

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)
3. Peter Jackson - Lord of the Rings (towner in FOTR, archer in TTT, pirate in ROTK)
4. Lucio Fulci - Perversion Story (The graphologist)
5. Phillip Noyce - The Bone Collector (Antique Bookshop Customer)
6. George Romero - The Crazies (Mayor of Evans City)
7. M. Night Shyamalan - The Village (Guard at desk)
8. M. Night Shyamalan - Unbreakable (Stadium Drug Dealer)
9. M. Night Shyamalan - The Sixth Sense (Dr. Hill)
10. Peter Jackson - The Frighteners (punk who bumps into Fox)
11. Hal Needham -  Cannonball Run ( outtakes through end credits)

[Tom]

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)
3. Peter Jackson - Lord of the Rings (towner in FOTR, archer in TTT, pirate in ROTK)
4. Lucio Fulci - Perversion Story (The graphologist)
5. Phillip Noyce - The Bone Collector (Antique Bookshop Customer)
6. George Romero - The Crazies (Mayor of Evans City)
7. M. Night Shyamalan - The Village (Guard at desk)
8. M. Night Shyamalan - Unbreakable (Stadium Drug Dealer)
9. M. Night Shyamalan - The Sixth Sense (Dr. Hill)
10. Peter Jackson - The Frighteners (punk who bumps into Fox)
11. Hal Needham -  Cannonball Run ( outtakes through end credits)
12. Martin Scorcese - The Aviator (Hell's Angels Projectionist)

[Achim]

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)
3. Peter Jackson - Lord of the Rings (towner in FOTR, archer in TTT, pirate in ROTK)
4. Lucio Fulci - Perversion Story (The graphologist)
5. Phillip Noyce - The Bone Collector (Antique Bookshop Customer)
6. George Romero - The Crazies (Mayor of Evans City)
7. M. Night Shyamalan - The Village (Guard at desk)
8. M. Night Shyamalan - Unbreakable (Stadium Drug Dealer)
9. M. Night Shyamalan - The Sixth Sense (Dr. Hill)
10. Peter Jackson - The Frighteners (punk who bumps into Fox)
11. Hal Needham -  Cannonball Run ( outtakes through end credits)
12. Martin Scorcese - The Aviator (Hell's Angels Projectionist)
13. George A. Romero - Dawn of the Dead (director at TV station)

[EnryWiki]

I am right on this : a cameo is uncredited?

Often so, but not necessarily, AFAIK.  A cameo is a bit part played by someone (a famous actor, the director, etc.) who would ordinarily not take it.

Quoting an entertainment glossary:

Originally meaning "a small piece of artwork", the term was borrowed by director Michael Anderson (I) when attempting to attract famous actors to play bit parts in Around the World in 80 Days (1956).

[EnryWiki]

1. Alfred Hitchcock - Psycho  (appeared in a cowboy hat)
2. The Wachowski Brothers - The Matrix (Window Cleaners)
3. Peter Jackson - Lord of the Rings (towner in FOTR, archer in TTT, pirate in ROTK)
4. Lucio Fulci - Perversion Story (The graphologist)
5. Phillip Noyce - The Bone Collector (Antique Bookshop Customer)
6. George Romero - The Crazies (Mayor of Evans City)
7. M. Night Shyamalan - The Village (Guard at desk)
8. M. Night Shyamalan - Unbreakable (Stadium Drug Dealer)
9. M. Night Shyamalan - The Sixth Sense (Dr. Hill)
10. Peter Jackson - The Frighteners (punk who bumps into Fox)
11. Hal Needham -  Cannonball Run ( outtakes through end credits)
12. Martin Scorcese - The Aviator (Hell's Angels Projectionist)
13. George A. Romero - Dawn of the Dead (director at TV station)
14. Federico Fellini - Roma (as himself)