First time I ever donated, the Red Cross made it difficult. We had just been on a mission trip to Mexico earlier that year, and we were out in the the sticks...which means none of the places we went to were in their book of Mexican cities (the ones that are safe, like Moneterrey, and the ones that aren't, like Mexico City). Passed that hurdle, then the nurse took my blood pressure. 160/108! Way, way off. I'm not hugely muscled or anything, but I have a good sized arm, and the cuff was a little small for me. She retook it with a different cuff and it was 120/80, which is normal for me. And we quickly cleared up the Hepatitis A vaccine that I'd had more than 6 weeks prior was not a problem. So finaly I got to give for the first time, and it went fine. That was at school during my senior year.
I gave again this year, in the Transylvania Bowl. It's a competition that Mississippi State, Ole Miss, and Southern Miss have with each other. We haven't won it in about 5 years, however, because MSU laws only allow donor services to take blood on campus 1 day a month. The competition goes for 3 days, and they're on campus all the time at Ole Miss. Not so at State. I learned that time that it's stupid to forget to eat breakfast before you go give, though. That one really took the wind out of me.
And IHadaPheo, maybe the 30 feet figure wasn't for going straight up against gravity? Nine feet is still dang impressive, however.