What was your most disappointing sexual encounter

A lot to chose from actually. Right up there challenging for the mumber one spot was when I thought I was going to engage in my first mff threesome. It was all going swimmingly except the two girls involved were just pranking me. They managed to create a situation where they hadnt even gotten down to their underwear and I was fully naked before they started laughing and informed me of their plot.
It as much more embarrassing because I have a very tiny penis ( which didnt go unnoticed and was definitely commented on)