The "shit shelf" allows a large shit to adhere vertically, temporarily becoming a pillar. The shit may then tip over, with the lower part acting as a joint. If

The "shit shelf" allows a large shit to adhere vertically, temporarily becoming a pillar. The shit may then tip over, with the lower part acting as a joint. If it tips forward and the shitter is male, then it smacks the scrotum. It's a weird surprise, suddenly getting touched there when not expecting it. Then there is an additional body part that needs cleaning.