"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"