What was your most embarrassing or funny sexual experience?

Maybe the time a friend of my girlfriend came to visit us for a weekend. My girlfriend loved to take photos of me masturbating and she showed them to her friend, who complained that she'd asked her boyfriend to masturbate while she watched, but he'd never done it for her. So I got volunteered to perform while she watched. To set the mood, so to speak, we were both naked on the couch and I was leaning back between her legs while she watched from over my shoulder. Normally, when I came masturbating I'd have cum onto my stomach, but I guess the situation made me extra excited or maybe pumping a bit harder than usual, so that when I came this time things really spurted and I shot up over my chest, over my shoulder, and actually hit her in the face -- which was a surprise for everyone.