
I might have to go with Liar, Liar. I think of all the movies it's held up the best. Had the right balance of seriousness and levity.
I would put the Truman Show and Dumb and Dumber as #2 and 3.
Low key The Yes Man is extremely underrated.
That's what I'm saying. Liar Liar was the perfect Jim Carrey movie. Classic Jim Carrey foolishness without the low brow humor and enough believeable drama and real world stakes.