Well you just dragged up a memory.
Was at a graduation party after my junior year of high school. The folks hosting had a pool, so swimming was done. Hanging out by the bonfire while doing some underage drinking and talking to this girl I'd started to move in on. I was half facing her, half facing the fire and standing. She was sitting and had turned away from the fire to face me. Unbeknownst to either of us, a friend of mine who is known for various shenanigans of the embarrassing type was sneaking around the fire behind me.
Now, back then, for whatever reason, many young men wore underwear under their swim trunks. I was not one of them. I hung loose under there because I preferred it and I dried out faster.
I wasn't nearly drunk enough to not be embarrassed by what followed: my friend ripped my swim trunks straight down to my ankles. I was shirtless, so effectively completely naked, and my meat and potatoes are directly in front of this girl's face.
Thankfully I had dried out and warmed up by then, but lordy did I turn red.