Frantically you pull at your pants to try and relieve the preasure. In you attempts you pants fall to your knees. A lump on the top of your rear draws your attention. In the mirror you watch with shock as a Tail starts to grow from out of it.
"NooooooooooooHeeeeeHaaaw!" You scream out. Then you throw your hands to your mouth. "Did that come out of me?" You think out loud.
The tail slapping against your legs raises your sense of panic.