Comedies

[Seppeh]

1. Borat: Cultural Learnings of America for Make Benefit Glorious Nation of Kazakhstan
2. Tommy Boy
3. Harold & Kumar Go to White Castle
4. Grandma's Boy

[OmahaBound]

In no particular order:

Dr. Strangelove
Tommy Boy
Anchorman
The Naked Gun
Monty Python and the Holy Grail

[gatorunvrsty]

Planes, Trains, and Automobiles
There's Something About Mary
Dirty Rotten Scoundrels
Orange County
Meet The Parents/Fockers
Old School
Cheech And Chong (any except The Corsican Brothers)

[KillerNut]

1. Dumb and Dumber
2. Ace Ventura - Pet Detective
3. Talladega Nights - Legend of Ricky Bobby
4. Tommy Boy
5. Happy Gilmore
6. Billy Madison
7. Monty Python - Holy Grail
8. Grandma's Boy
9. Big Daddy
10. Cheech and Chong - up in smoke

[SavageOrangeJug]

American Graffitti, best ever made.

Young Frankenstein gets honorable mention.

[gatormaniac]

Lots of my favorites are already listed. I would add the recent " Wild Hogs " to the list. One of the few times I've been to the theater when everyone was LOL.

I would also add " Mars Attacks! ".

[QC_Dawg]

Borat was definitely the hardest I've ever laughed in a theater, but I don't think it has lasting appeal.

So, in no particular order: This is Spinal Tap, The Big Lebowski, Dumb and Dumber, Airplane!, Blazing Saddles, Clerks, Swingers, Kung-Fu Hustle, Saved!, Shaun of the Dead...

I could go on forever, but this list will do for now I suppose

[A-TownDawgPound]

The Life Aquatic with Steve Zissou

[Zee]

Dumb and Dumber is #1, by far the best

honorable mention: The Three Amigos, Zoolander, Swingers, Old School...