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Being that appears abruptly 30 seconds after you lock the door in a public restroom, pounding hysterically (and wordlessly) for admittance.

Banished by the Latin spell, "Its inuse" or the equivalent, the toilet demon mysteriously vanishes and is nowhere to be seen when the door is opened.
Horrified, the Starbucks barista somehow managed to vanquish the howling, pounding toilet demon with an urgent "Someones usingit!"
by Directive 10-289 June 01, 2009