Did I Actually Do That? A Memory Dilemma

A yellow overhead sign in a dimly lit parking garage reads 'PLEASE PAY YOUR PARKING FEE BEFORE EXISTING'. The sign features a small icon of a parking meter on the left. Several cars are parked below, and a person walks in the background. The text is a play on words, using 'existing' to mean 'leaving' or 'exiting' the parking area, implying payment is required before leaving.