I submit the following comment:

Thirteen years ago I was nearing the end of a pregnancy, and the doctor was trying to find out whether the baby was head-down (good) or head-up (bad) without resorting to an ultrasound.

He felt something up at the top of my belly, then he moved down and felt something at the bottom, then something up at the top again, frowning the whole time.

“Sometimes it’s hard to tell their butts from their heads,” he admitted.

We then both cracked up, because the thought occurred to both of us at the same time: That can be said about a lot of adults.