Blazing Saddles
Airplane! I and II, also known as Flying High! outside the US
Monty Python and the Holy Grail
Top Secret!
Kentucky Fried Movie
Mr Vampire. Kind of a comedy, horror, kung-fu movie. There are a lot of sequels, but most didn't have as much comedy.
Chinese Ghost Story I and III. Similar mix.
Hot Shots!, and Hot Shots! Part Deux.
The Producers.
Trading Places.
House. (1986). Comedy/horror.
Silver Streak.
Abbott and Costello Meet Frankenstein.
Naked Gun movies.