Birthday... who pays?

[PM_Mama00]

I just read Senusret's post in the drunk thread, and I didn't wana hijack.

My lil sis and I share the same birthday. After our Monday night meeting, we went to the usual "after-meeting" bar. It was her 21st, my 22nd. Who bought us drinks? No one. We bought each other a shot, and did them by ourselves. Also, on my 21st my parents got me a really nice limo for the night. I bought ALL of my drinks and limo-alcohol.... after I invited all these people in my limo.

So.... when you go out for your friends' birthdays, do you ever offer a drink?