Oh god, I got another one.
I was hanging out in a friend's dorm room. His female friend randomly wanders in to say hi. Since I hadn't met her, we exchanged names from across the room, but I didn't understand hers. She was Muslim, and the name was kind of difficult. After repeating it twice, I still couldn't get it, and felt like such a moron.
Right as I was about to give it one last try, I farted. Loudly. I quickly froze position, and my male friends turned and just stared for a second. Once the shock wore off, we started going nuts, rolling around the room laughing.
The thing is, this poor muslim girl apparently DIDN'T HEAR THE FART. She's standing there going "omg! What did I do?!? What's going on!?!" and we're like "hahaha...nothing... nothing..." She just stood there getting more and more frantic, looking like she was about to cry.
We never told her.