I've seen it everywhere except airplanes. I don't recall ever seeing it on planes. How often have you seen that? Do passengers or flight attendants do anything? How does the person respond?

I had it happen to me, on a long-haul flight, in business class. I was shocked. I stood up to look at the guy after no-one did anything.

I told him that phone speakers "make me gassy" and then he turned it off.

Kids playing games is the truly annoying one. You feel terrible saying anything but it’s also some of the most annoying sounds.