Toilet paper crisis

Okay, so we've all been here at one point in our lives(don't even try to deny it.) It's that horrifying moment when you realize at the very last minute that you're completely out of toilet paper. Let's just say you really really REALLY have to potty. You're looking EVERYWHERE for a roll, but there isn't any. Now you just can't hold it in anymore. To make matters worse, there's no one around to find/get any for you, so you had to improvise.

What's the weirdest thing you've ever had to use in place of tissue when you've run out?

Not even gonna lie, I one had to use a few semi greasy McDonald's napkins until I could run down to the store.