(Inspired by the William Castle movie The Tingler.)
Like the Tingler, The Tinkler is a creature everyone has inside of them, and when someone gets scared, the fear causes the Tinkler to wrap around and squeeze their bladder, causing them to pee their pants. And this is why people pee their pants when they get overly frightened, which we all know happens sometimes.
And if you try to resist the squeezing of the Tinkler, you can die! (And then you'll pee your pants anyway. So the Tinkler wins either way.)
Hey, come to think of it, this would make a fun Halloween ad for Depend Undergarments (although they would probably never make it {buzzkills}). They could show a B&W movie trailer for The Tinkler (a joke on The Tingler), saying the bit about the Tinkler squeezing your bladder when you're overly frightened, and that resisting the Tinkler can kill you. (Okay, maybe the kill you part goes a bit too far, even as a joke.) But it's no problem, because when you wear Depend Undergarments, you can pee your pants from fright, or for whatever other reason, and you're completely protected from any embarrassment or mess, so you can let the Tinkler do its worst without worry or consequence.