Bad manners

He left a 15 % tip.

I get angry when people cut in line in front of me.

The boy's stare was starting to make Laura uncomfortable.

"I'll clean the kitchen if you clean the car." "OK, it's a bargain."

People might stare at you for walking barefoot.

The two men shook hands on the deal.

Instead of shaking hands, people in some Asian cultures prefer to bow.

You should try to keep your voice down in public.