Jump to conclusion!

Santa and his friend are watching a film in a theatre. Just before the interval they see a man standing on the rooftop looking down.
During the break the friend says to Santa: I bet the man will jump and break his bones.
Santa says: No, I am sure he would not
So they decide that whoever looses treats the other to a drink after the film. Santa loses.
When they are having the drink, the friend says: I must confess that the bet was not fair. I was seeing the film for the second time so I knew what was going to happen.
Santa replies: Same here, but I was sure the fool would not jump again.

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from : SantaBanta.com