I have to say there are several really bad actors in both television and movies. Local tv, we will have the notoroious Pierre Png. Watching him act and sprout Mandarin lines is as painful as watching paint dry. Hollywood-wise, we have Keanu Reeves - 1 expression to fit them all!
But when it comes to worst actor, i will say a very worthy contender will be David Caruso of CSI: Miami. 9 out of 10 times he'll put on his dorky sunglasses right before he says one of his lame one liners.
Youtube Video: http://www.youtube.com/watch?v=GeeyWvo1rNg
[Detective]: She had large deposits of semen in both ears.
[Horatio played by Caruso]: So I guess she (puts on glasses) heard her killer 'coming'...
Leon Lai.
Vickie Guerrero