You really don't know where that's been.

So I was just going to the bathroom...
and I dropped five ones into the toilet.
I'm in desperate need of money so of course i fished it out.
I wasn't about to literally flush five dollars down the toilet.
(That made me laugh)
Anyway, so I just thought I let you know next time you readers out there decide to put a dollar in your mouth for some reason, or you see someone with a dollar in their mouth just think,
"Charlie could have peed on that dollar"

Oh, I washed them by the way. I didn't just decide to leave the pee on them.