No particular order but...
1. The Jerk
2. Spaceballs
3. Airplane!
Are you kidding me? Maybe if that's a list for the top 3 LAMEST movies of all time.
In order...
1) Dumb and Dumber (Funniest movie in the world, hands down)
2) South Park: Bigger, Longer, Uncut
3) Cheech & Chong: Up in Smoke
Honorable mentions: Billy Madison, Deuce Bigalow 1 & 2, Me, Myself and Irene, Forrest Gump lol