When I was 16 or 17, I tried anal sex for the first time. I used a blue lube I'd bought in the mall and gloves (thank goodness). When I put my finger inside her, I realized right away that she had not *vacated* her bowels first. I tried to play it cool and not freak out, but I just didn't have enough room to stimulate her, so I removed my fingers.
Then she sat up abruptly and announced, "SOMETHING JUST CAME OUT!" and ran to the restroom holding her butt cheeks.
I sat on the edge of the bed trying my best to forget the situation, but I knew that I would remember it forever.
I heard her screaming from the restroom, "OH MY GOD, IT'S BLUE!"
Tragically, it turned me off anal sex for a while.