Please answer this Etiquette question on the subject of a lunch invitation?

At work I go into a guy's office and ask him to come down and get some lunch. An intern is sitting there he shares the office with my attorney friend. My attorney friend INVITES the intern.
Here's my beef. To me it goes without saying that if somebody asks you to go to lunch, you don;t invite somebody else unless it's at least DISCUSSED with the guy that invited you in the first place. A simple "Hey should we invite so and so" is all it would have taken. So I told my friend he has no lunch invitation etiquette. What say you?

I'd give your attorney friend the benefit of the doubt. Maybe he didn't want the intern to feel left out, but if you were taking your attorney friend out to lunch then it is not his place to invite other people.

Next time you invite him out for lunch, make sure he is the only one present, and you make it clear that you want it to be one on one.

I agree completely. Thats rude if you ask me.

It's work lunch not a "date" your Attourney friend had every right to invite the intern along. If you wanted a "date" with the attourney you should have made it clear.

the "chairperson" or whoever started the thing should be th only one to be able to invite others. If you invited me for dinner, i have no right to bring others, unless i ask (but i shouldnt)

i agree

I would have to agree with you, he should've asked first!

You are wrong. If you asked someone to lunch in front of this other person than you are rude. If only wanted this person to go then you should ask in private.

You said "Come down and get some lunch"? That isn't exactly an exclusive invitation. It sounds like, "There is lunch, and anyone who wants some can come and get it" You just didn't specify whether it was a personal invite or not. Plus, you shouldn't have asked in front of the intern. That was just plain rude. If you wanted it private, you should have asked in private. You brought it on yourself.

I would not invite someone to lunch at the office in front of other people. Poor form, that.