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The re-uptake of the pen you were just using into the stratosphere (or so it seems); when the pen you had manages do disappear without a trace from the face of the earth, to be found again long, long after you've given up (if ever)
"I was JUST writing notes with that pen, where the HELL did it manage to get to!?!?"

"Looks like you've just experienced pen evaporation, brah."
by FireHaze June 18, 2009