The Toilet that Never Forgets

Every time someone sits on this toilet, the toilet records the identity of the sitter using buttock recognition technology.

If the person gets up and leaves without flushing, or leaves toilet tissue all over the seat, the toilet saves the identity of the user in its databank.

If the offender uses the same toilet again, the toilet will beep and politely warn "You did not flush last time - Please flush after every use".

Repeat offenders are treated to a nastier system of alarms and red lights, thereby notifying the other people in the bathroom so they can lurk outside the offender's stall and point at him when he leaves.

The offender can use a different toilet each time, but only for so long, before he has to come back to the first toilet -- and remember, *this* toilet never forgets.