The worst movie I've ever seen was a horror film from the 70's called Bloodfreak. Acting was horrid, effects were terrible, and the man with a turkey head was so obviously fake it was laughable. In fact, the plot was laughable.
A drug addicted biker eats radioactive turkey to earn some money, and gets a turkey head. He can't smoke through his beak, and starts killing people who are high so he can drink their blood and get high off of that.
Totally humourous.
[URL]http://www.youtube.com/watch?v=oq9A3kZdy00[/URL]