I've volunteered a few times for charity solicitations. The worst thing I can remember doing is calling an alumnus and since they were friendly, I noted that their graduation year was the same year I was born. They got pissed off at me; now I may have been young and stupid, true - but to be fair, now that I'm on the other end of that potential scenario, I honestly would not be upset by some kid pointing it out. I'd probably laugh at them. (But I never yelled at anyone!)