Joe goes into a bar on his way home. He sits down next to an attractive young blonde to watch the news on the TV.  
The news was just coming on and they were covering the story of a man on a ledge of a large building preparing to jump.
The blonde looked at Joe and said:
"Do you think he'll jump?"
Joe said: "You know, I reckon he'll jump."
The blonde replied: "Well, I bet he won't."
Joe placed a $20 bill on the bar and said ....
"You're on!"
The blonde placed her money on the bar, and kept watching the scene on the TV.
The guy on the ledge did a swan dive off the building, falling to his death.
The blonde was very upset, but willingly handed her $20 to Joe.
"Fair's fair - here's your money."
Joe replied: "Listen, I can't take your money;
I saw this earlier on the 5pm news, so I knew he would jump."
The blonde replied: "I did too, but I never thought that he would do it twice.