Oh, I have the best story!
I was 11, wearing burgandy pants (thank god for small mercies) and volunteering in the school library. Anyway, I realized something was going on so I excused myself and ran to the bathroom where I figured out I'd gotten my period (and it was one HEAVY mother f*****, it had already bled through my pants in a huge area). So I jammed as much TP as I could down my underwear and snuck out of school because I was too embarrassed to tell my teacher. I took the bus home and dealt with things there, and to that end things were fine, until...
...I get to school the next morning and the librarian wants to know if I'd been working with red sharpie and left it uncapped because the library carpeting had a HUGE RED STAIN on it where I was sitting. I'm pretty sure I lied and said I didn't know a thing about it.
Now it's just funny, but for the rest of that year? Humiliating.