Care to offer up some suggestions for my DIL's college assignment?

Her assignment is to go in a public place and doing something rude, then make note of the responses. My son said, “Like, making eye contact with people in an elevator, or burping really loud in a restaurant.”
I’ve been thinking about it. Maybe turn your phone volume on high and turn your keyboard sounds on? Bloop, bleep, bloop, bloop, bleep, squeal, bloop, bleep, bleep….
Shouting at someone on the phone in a restaurant? (And isn’t it sad that there are people who exactly those things and have no idea how rude it is.)

What ideas do you have? Have fun!