Yes

Your boss doesn't seem to be noticing you. But then, being the clumsy guy you are, you actually drop the dildo you were just about to fuck yourself with. You hear it hit the dirty tile floor and it rolls across the uneven surface. As fate would have it, it's your boss's shoe that catches it.

A second later the stall door is being pulled open (you really should have locked it before going in here) and your boss has caught you with your pants down.