Jimmy Fallon takes over NBC's "Late Night" from Conan O'Brien tonight.

His producers have big plans for new ways to profit from late night talk, and after months of practice on the Internet, they're confident Jimmy will succeed.

But the NBC, CBS, Fox and Disney execs behind some of the worst talk show flops in TV history were equally as confident.

Click through, and you'll see that confidence didn't stop everything from going horribly wrong.