They do an episode when Bart's older, and he does a science project on human reproduction with experimentation.

That could work.

In the meantime, he could prank kids who might be tempted to buy one of those toys where they say push this button for several hours and wear out the batteries.
Take care and God bless

Here are a couple more prank call ideas I thought of that should definitely meet with the approval of prank phone call fans. Call for someone with the first name Fae or May and the last name Gut because if Moe was to announce he's looking for a Fae Gut, it would sound like he's looking for a ******.