Brush my teeth with... god only knows.
Last night my roommate left her dirty panties on my tooth brush. She said it was an accident, and I believe her. She was pretty embarrassed, and offered me a brand new toothbrush. I refused, thinking that it might be a bit insulting to accept, implying that she has cooties or something. So I lather up the brush and start brushing as usual. Two seconds later it hits me: this brush was touching her dirty panties, which was touching her crouch, and now it's in my mouth. That's... kinda weird.