Quotes: You Have to Believe Me

"I have to blow everything up! It's the only way to prove I'm not crazy!"
- Gordon Freeman on why he's detonating a stockpile of explosives via grenade

"Scully, you have to believe me. No one else on this whole damn planet does or ever will. You're my one in five billion."
Mulder, The X-Files, "Folie a Deux"

"Our wives, our children, everyone! They're here already! You're next! You're next!"
Dr. Miles Bennell trying to convince random people that he's not crazy, Invasion of the Body Snatchers

Rasoul: How very convenient.
Aladdin: It's the truth! Why won't you believe me?
Jafar, disguised as Jasmine: Because we know you're lying.

"Why won't anyone believe my crazy story?"
Homer Simpson, The Simpsons, "Treehouse of Horror VII"