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."