Went to lunch with two new-to-the-team guys and two regular lunch friends today, and as I'm paying the bill, one of the regulars says, "Oh, but the new guys aren't going to pay, right? Just us?"
I'm sure he was just trying to reinforce that he planned to pay, but at that point, I had to cover the two other guys' lunch or look like a cur.
(The place was cheap, but I think I'll have to think hard before inviting that guy to the Trattoria I'd been hoping to revisit soon.)