What was the most mortifying experience you’ve had with a guy?

I have two:

The first was only the second time I ever made out with a guy. While we were kissing he squeezed my waist and it tickled me so I reflexively doubled over and basically head-butted him leaving him with a fat lip. I was mortified but after I explained what happened he was pretty cool about it, though the mood was already spoiled!

The other was when a we were parked in a park at night and he was giving me head when a cop pulled up and found us! Fortunately, all he did was tell us we had to leave the closed park but it scared us enough that he just drove me home without finishing the deed.