1.

If the service in a restaurant is very bad,

you aren't expected to leave a tip.

2.

If you've been to a friend's home for dinner,

it's the custom to call and thank them.

3.

When you want to smoke in public,

you're expected to ask the people near you.

4.

When you go out on a date,

it's acceptable to share the expenses.

5.

If you plan to visit someone at home,

you're supposed to call first.

6.

When you meet someone for the first time,

you aren't supposed to hug or kiss them.