Blazing Saddles and Young Frankenstein, most definitely.
Just about any Marx Brothers movie, especially Duck Soup and A Night at the Opera.
Also, The Freshman, with Marlon Brando's hysterical parody of his Godfather character and Burt Parks singing to the komodo dragon.
And Kind Hearts and Coronets, with Alec Guiness as just about every other character, male or female.
And The Wrong Box, with Peter Cook and Dudley Moore, and Peter Seller with all those cats.