There are two situations in which farting can be disastrous. One such situation is when you’re alone so you let one rip, and then moments later someone walks over. If y’all are the only two people there, you’re pretty doomed.
The other situation, which, mind you, has never happened to me, is when you’re listening to loud music with headphones on and let one rip. The ensuing terror that results from not knowing whether or not the fart was audible and heard by the surrounding people is almost unbearable, until you realize you’re polishing dentures and no one cares. At least, I think that’s how it would feel.