I avoided movies that had humor but that I felt were more focused on an additional genre (drama, etc), so movies like BRAZIL and BACK TO THE FUTURE didn't make my list.
Also just missing my (typically spur-of-the-moment) top 50, in alphabetical order:
All of Me (1984)
Dead Alive aka Braindead (1992)
Down and Out in Beverly Hills (1986)
Galaxy Quest (1999)
The Gods Must Be Crazy (1980)
Office Space (1999)
Overboard (1987)
Re-Animator (1985)
Repo Man (1984)
Summer School (1987)
Time Bandits (1981)
Waiting for Guffman (1996)
Weekend At Bernie’s (1989)