A friend of mine worked in an ER in the SF Bay area.

One night, a fellow come in with a vibrator lodged so far
up his backside that he'd lost his grip on it and the thing
had gotten stuck, indeed, pretty much disappeared.

It was turned on.

As a succession of doctors, nurses, and techs came in to
examine the situation and offer advice, they'd part the
fellows, um, 'cheeks' whereupon the sound of the machine
would alter thusly: mmmmmMMMMMMMMMWAHHHHHHHHHHmmmmmm

Whereupon everyone within earshot who knew what was going
on would split their sides trying to control incurable cases of
the giggles.