I dont know about a favorite, but some wonderful movies that i think have not been mentioned:
Zorba the Greek
The Last Picture Show
Young Frankenstein
Spaceballs
A couple Woody Allen movies- Annie Hall, Sleeper, Love and Death
Fanny and Alexander (any Ingmar Bergman, really)
Small Change (likewise, any Truffaut)
My Cousin Vinny
Tampopo
Of course the Marx Brothers (Animal Crackers is my personal favorite)
Thats all i can think of right now. If you haven't seen/heard of these movies you should check them out because they're all fantatsic
-Singingintent