It must be released in the 1990s and you have to do it from memory, no using outside lists!
Multiple entries from the same year are fine and you don't have to list the exact year if you don't know it.
Here are mine off the top of my head:
1990 - Opportunity Knocks
1992 - Wayne's World
1993 - Wayne's World 2
1993 - Coneheads
1993 - CB4
1994 - Dumb & Dumber
1994 - Tommy Boy
1994 - Airheads
1994 - Ace Ventura: Pet Detective
1995 - Billy Madison
1995 - Ace Ventura: When Nature Calls
1995 - Black Sheep
1996 - The Cable Guy
1996 - Happy Gilmore
1997 - Liar Liar
1998 - The Wedding Singer
1998 - There's Something About Mary
1998 - A Night at the Roxbury
1999 - Big Daddy, Deuce Bigalow: Male Gigolo
I can't think of anything good from 1991.