I had that movie on VHS growing up and watched it all the time..so definitely a fave but would have to agree with you...I think Me, Myself and Irene might be my fav. Dumb and Dumber is a classic fave as well.
Others I really enjoy:
Ace Ventura 1 & 2 but when Nature Calls is the better one imo (the 2nd one)
Dumb and Dumber
The Cable Guy
Fun with Dick and Jane
The Mask (wouldn't put it in my top 10 though)
Top 3 in no order: Me, Myself and Irene, Liar Liar and Dumb and Dumber