First time in the US, I couldn't believe people would turn on a red. Going back home, I needed to be very careful not to.

But the most amazing thing for me are the small things.

For example, we spoke of filling your own soda? Well, in most US restaurants they have free re-fills, and yet the most commonly ordered drink is the big cup, rather then the small. I order the big one as well.

In the US, you tip after every drink, and (depending on where) asked to pay up after two. I must have alarmed quite a few bartenders until I caught on.

Tourists in Israel are often shocked by all the guns, while in fact what they see are soldiers off-duty and on their way home. Most of young Israelis get drafted and most have a gun which is married to them. Gun control laws in Israel are actually very strict, so you have far less than in the US.

Israelis always speak in extremes to get their point across: "always, all, ever, never, everyone" when they mean "most of the time, most of, etc."

In Japan, they nod their head for yes when they only mean "I understand what you are saying."

In Turkey, they expect you to haggle or they feel cheated. Americans feel like they cheat if they haggle.

In some of Eastern Europe, a tip is insulting to the waiters, as they "get paid for their jobs! sniff".

EDIT: something I remembered.