I go to the cinema very rarely, so I have to back to the 1980s and Dune.
Worst film I have ever seen was The Football Factory which was on telly late at night when I was working away from home and didn't have Sky.
Worst actor in the history of cinema has to be Jason Statham. Eye candy he may be for some, but I have had more talent pass though my bowels today than he has ever shown on screen. Sharon Stone's performance, if you can call it that, in the otherwise very good "Casino" was the worst I have seen from a laydee.