For me it's loud eaters . . . plate clinkers, food crunchers, etc. I have 3 brothers-in-law and they all eat with too much volume. Knives and forks clinking on plates and bowls, slurping, crunching, teeth sucking. It drives me crazy.
I can handle a kid snapping their gum for a minute or two, but when an adult does it, I just wanna' smack that gum out of their mouth!
