Jumps

A blonde and a brunette were watching the 11:00 news. The current news story was about a man up on a ledge and threatening to jump. The station cuts to a commercial.
Brunette: I bet you $20 he's going to jump.
Blonde: OK.
(back to newscast)
He jumps.
Blonde: OK Here's my $20.
Brunette: No, that was too easy. I can't take it.
Blonde: I insist. I lost.
Brunette: I have a confession to make. I saw the same thing on the 6:00 news and knew he jumped. So it wasn't really a good bet.
Blonde: I know. I saw the same newscast. But I didn't think he would be stupid enough to jump twice.