8. Wesley Snipes
It's well documented that in recent times Wesley Snipes hasn't been too hot on paying his taxes - hence him preparing to finish up a custodial sentence for it this July - but that isn't exactly a sign you're going nuts. However, Snipes' behaviour on the set of his last big film, Blade: Trinity, certainly is; comedian Patton Oswalt reported that Snipes kept in character as Blade for the entirety of the shoot, which is rather at odds with the fact that he refused to come out of his trailer except for close-ups and other big shots. The result? Ryan Reynolds was thrown the ball to let loose with ad-libbing for his character Hannibal King, and that's why so much of it appears in the final film. Snipes reportedly tried to strangle Goyer once, resulting in Snipes eventually opting to communicate with Goyer via post-it note. And guess how he'd sign each post-it note? You got it; Blade.