People at gun ranges that are careless where they point muzzles and idiots shooting pistols at rifle ranges. You'd think they would get a clue all the puffs of dirt kicking up way short of their targets! Makes me nervouse worrying about ricochettes.
And guys, it's not the long lines in stores that bother me, unless there's multiple checkouts but only one or two open, it's the cashiers that ignore those waiting while chatting about their life histories with the one person getting checked out. They aren't getting paid to visit with friends and need to do their dang jobs!