The United States can be a superbly weird place for first time visitors—and I’m saying that as an American.

For one, we’re one of the only countries in the world that hasn’t adopted the metric system. Why? Because we’re ‘Murica. That’s why!

And then we have that whole controversial restaurant tipping system going on, confusing the hell out of foreign tourists. Those poor, lost travelers are brimming with questions: Do you tip the same amount on every bill? Or is it a percentage? Do you tip everyone who sells you anything? What happens if you don’t tip?

Case in point: Something that is totally normal in the United States can be considered really strange in other countries. But what are some other things besides our culture of tipping that would be deemed abnormal by non-Americans?

In a hilarious post in the Ask Reddit community, Reddit user OhThatNewGuy asked: “What do Americans do without a second thought that would shock non-Americans?”

Here’s what the Reddit community wrote:

Presidential elections

How Americans build sinks?

The way Americans talk

American sizes

Drive-thrus

Parking lot dinners

Sending family Christmas cards

Traffic laws

“How are you?”

How Americans view distance

Tips

The overly-friendly American

Eating donuts

Read more testimonials about Americans’ surreal habits here.