Zipper Elves
Are fast fingers that strike suddenly and without warning. Typically this happens while being distracted. (Normally these elves strike during the act of making out.)
Jim Bob and Sally Jo were making out in the parking lot, after their date. While Sally Jo was distracting Jim Bob, the zipper elves struck, and to Jim Bob's surprise he could feel a cool breeze down under. Jim Bob didn't seem to mind :-)