Used Cars
Night Shift
The Sure Thing
Dr. Strangelove

{Disclaimer: I don't know if any/all of those qualify as "under the radar" comedies.}

+1 on UHF and 1941

Best in Show

Spinal Tap
Princess Bride
Dr. Strangelove
Dracula Dead and Loving It (Leslie Nielsen and Mel Brooks together!)
Groundhog Day
And Now for Something Completely Different

Agree with 1941.

Spielberg' first "flop" is an underrated masterpiece of screwball comedy.

Was so happy to hear the FTAB start performing John William's March from the film during football games.

Deuce Bigalow Male Gigalow is my pick for under appreciated

And my personal favorites: Hot Rod and Grandma's Boy

Objective Aggie said:

---

Mostly forgotten but I loved Diner.

Great cast

---

Good flick

War of the Roses
Modern Problems
Extract
Thursday
Funny Farm
History of the World: Part I
Soul Man
The Distinguished Gentleman

Drop Dead Gorgeous
Fish Called Wanda

Great Thread

Mother, Juggs and Speed.

Freebie and the Bean

Diner

Texasville

Cannery Row

Sex drive is by far my favorite underrated comedy

Funny Farm
The Golden Child

Even with that staff edit, about half of this thread would make anybody's all-time top comedy list. There's also some really great one's mentioned that I love like UHF, Saving Silverman, Dirty Work, and Popstar.

I'll add a few I didn't see. Half Baked will always be a favorite, and I still quote this movie probably at least weekly. I know it's not for everybody, but surprised I didn't see Pootie Tang. A movie nobody outside of my group of high school friends even saw, let alone liked, is Trapped in Paradise and I still love to watch it around Christmas.

Movie - Pink Panther Strikes Again (Peter Sellers)
TV Series - Fawlty Towers (John Cleese)

Bonus
Underrated Kids Movie - Wallace and Gromit: Curse of the Were-Rabbit

Real Genius for sure.

The 3 Amigos. It may be a classic to some, but I've run into more people who haven't heard of it than have. Same with Office Space. I have co-workers from their mid twenties to mid forties who have never heard of it or seen it.

I'm black?!? Does Dad know?! This changes everything! Cancel my swim lessons!

I cant remember if I already said this but Harold and Kumar Escape from Guantanamo Bay is one of the biggest laughs of any movie I have ever seen