This one time at band camp....
Seriously, this one time at my karate class, I had some serious gas build up. I was having to squeeze the butt cheeks hard to keep it in. So all the students are lying on the ground in like a half crunch and holding it. I'm already in a precarious position. My instructor comes over and pushes down on my stomach with his foot. The flood gates open and it rips. The fart ripped through the silence. Tore it to shreds.

That was a little awkward.