I don't know what happened or why. I was the only one home using the toilet today. My boyfriend came home from work and was freaking out because the seat was a grayish purple color. It won't come off. I have my period currently so I can't be pregnant. I had a pair of jeans I wore to work for 3 days that are kinda new, but my butt isn't blue, and it did,t happen right away like when I say up from toilet. Plus, I don't sit on the toilet with clothes on.