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1.
Used at the end of a story to spice it up, make it interesting, or to just keep someone's attention.
It took so long walking home from school, my feet were killing me. When I got home I threw my shoes into my closet, and then a skeleton popped out.
by LeJesseRawrs May 17, 2010
 
2.
The phrase "AND THEN A SKELETON POPPED OUT" is often used to point out that the ending of a creepypasta is predictable or just downright shitty.

Basically, to use it, suddenly end your story with ", and then a skeleton popped out." Instant horror story.
I went to walk my dog, and I couldn't get the front door to open AND THEN A SKELETON POPPED OUT!
by Pinkamina Diane Pie July 27, 2011