Bit of a personal choice, this:
1. Helpmates (Laurel & Hardy, 1932)
2. Monty Python and the Holy Grail (1975)
3. Up In Smoke (Cheech & Chong, 1978)
4. Blazing Saddles (Mel Brooks, 1974)
5. The Blues Brothers (John Landis, 1978)
Plus any other movies by the above (with the exception of C&C) would feature highly in my top 100.
Honourable mention (sic): Carry On, The Marx Brothers, Zucker Brothers pre-Scary Movie, Guest House Paradiso (Ade EdmonRABon, 1999)
He was great in Die Hard 4.0.