I have a few personal worst movies....
1) Bridges of Madison County (i was forced to watch it, fell asleep 15mins in)
2) Men In Black 2 (what a dissapointment!)
3) Godfather Pt. 3
I have a few 'worst' movies that I really enjoyed tho...
I'm with paxx, I really liked Waterworld. Remeber Battlefield Earth 3000? It bombed in theatres, I thought it was great! I have very strange tastes though.
But the all-time worst movie has GOT to be Mariah Carrey in Glitter. C'mon, it's not even debatable.