1. Fearless Leader - The Adventures Of Rocky And Bullwinkle
There's a reason The Adventures of Rocky and Bullwinkle routinely features on the 'Worst Movies Ever' lists - and that's because it's an embarrassing farce that leaves everybody involved looking shamed. And worse of all, De Niro is the worst offender. In amongst the shoddy CGI and the anaemic jokes is a performance so embarrassing it's a miracle De Niro ever worked again. In fact, if the actor in question wasn't Robert De Niro, then there is a good chance they would never have worked again. The performance just leaves a bad taste in the mouth, and whilst camp is often good fun, here it is the most irritating thing imaginable. Doing a stupidly exaggerated European accent whilst acting hysterically in ways you've never even thought of genuinely make this one of the worst movie performances of all time. Sadly, this wasn't the first or the last time De Niro let his dignity at the door when agreeing to be in a movie. He somehow manages to come across as Dr. Evil parody, who himself is a parody of Blofeld - and when you're doing a parody of a parody, you know you've gone wrong somewhere. Just don't even get me started on the recreation of *THAT* Taxi Driver scene.