The following list of offensive behavior was published by Forbes.com.
The host pays
1. Don't invite people to lunch just because you want expert advice for free.
2. Don't choose a restaurant close to you, but far away for the others.
3. Don't forget to book the lunch in advance.
4. Don't assume that the guests you invite will pay for themselves. You take care of that.
5. Don't argue with the staff. If there are any problems, don't deal with them in front of others.
6. Don't cancel business lunches at the last minute because you're busy.
7. Don't order food which is too time consuming to prepare.
8. Don't use your phone to call, send messages or anything else during the lunch.
9. Don't put down colleagues or anyone else. You never know who can hear you.
10. Don't deal with any bad news or unpleasant personal affairs of your guests (e.g. layoffs).
-kk-