Here's something that happened a few weeks back. We usually meet the same people for drinks every now and then; sometimes we'll eat afterwards (once everyone's arrived) but on this occasion I was only gonna stay for one, maybe two drinks.
Now, I didn't wanna get into the whole "rounds" game, primarily because I knew I was leaving early. So, I got to the bar first, bought my drink and sat down at a table. As people came, they got a drink from the bar and joined the table.
After a while, one of the party gets up to get drinks. I decline the offer (as I've still got plenty and don't wanna then hang around to buy one back, as I'm pressed for time).
It takes him ages to get drinks, so by the time he returns, I'm done with my drink but still have some time before I leave. So, I go to get a drink, knowing that everyone has just got theirs, only to have the dude (who has just come back with a full drink) say "while you're there, get me one!"
I guess my question is, am I entitled to ask for money? I mean, if I'm making a point of NOT getting involved with the rounds system, what right does someone have to try to make me?