Here’s a frame in progress of another little animation I’ve been working on from time to time…
It’s a little too rough to show, really, and could do with more redrawing—that arm looks quite awful, I tell you—but what it’s going to be is basically encapsulated here: a rabbit pulls back his foreskin and instead of a dick inside is another rabbit!  The new rabbit falls out… and the process repeats.
This is actually a response to a challenge posted a couple years ago that had somehow managed not to make it onto the to-do list for quite some time.