During the time when I was powerlifiing training at my university's weight room, I set myself up for a weighted squatted. My stomach was feeling awful, so I decided not to use my lifting belt to reduce any discomfort from my mid-section. As I rested the bar on my traps, my stomach squeezed and cramped -- but I just ignored it. I had squats to do.
As I squatted down, I let go the nastiest fart known to man. Lucky for me, the powerlifting gym already smelled like sweaty private parts and moldy socks -- so I was good. I am sure a few of my teammates heard me let it rip, but if they did, they didn't say anything.