Something In Public You Can't Stand?

What's something in public that you really just can't stand?
I can't stand people who show public displays of affection.
I also can't stand people who "sag" their pants.

I hate people who like make out in public, kidding quick and holding hands is fine.by me.

People.who sag their pants are disgusting, can't stand it.

I can't stand people who chew open mouthed in public. Its gross.