Ace did his 20th donation the other day, and I did my 10th. Mum did her 30th and my brother did his first ever, with his new girlfriend, who is blood type O-negative, which is really rare around here, apparently.
All five of us coming in together, laughing and chatting unnerved the nurses a bit at first, because we have four last names between the five of us and it was late at night on a Thursday, so we clearly weren't a 'work' group. But once we explained how we were all related they thought it was great.