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1.
Someone to whom you have already told your story who interrupts you right at the pivotal part of your story to steal the punchline and receive the laughs.
Storyteller - So me and my friends were teepeeing this lady's house. We put toilet paper in her tree and wrapped her car in cellophane and...
Storyjumper- ...and then the lady comes out with a paintball gun and starts shooting at them. (laughter)
by A. C. McDonald June 11, 2007
 
2.
Someone to whom you have already told your story who interrupts you right at the pivotal part of your story to steal the punchline and receive the laughs.

Storyteller - So me and my friends were teepeeing this lady's house. We put toilet paper in her tree and wrapped her car in cellophane and...
Storyjumper- ...and then the lady comes out with a paintball gun and starts shooting at them. (laughter)
by A. C. McDonald July 18, 2007