For me it was during a parade.
I was at a festival, looking for a toilet, when a cute girl just started talking to me out of the blue.
I sat down next to her, we talked for a while, then she asked if I wanted to walk with her for a little bit.
We found a hidden spot, sat down and started to make out. It got pretty heated pretty quickly.
After a while, she stopped, looked me deep in the eyes, and said “I’d really love to blow you right now.”
And I replied “sorry, but I really have to pee.”