Another Donation Dilemma

So. . .I made a second attempt at donating blood, and was again unsuccessful. Even more pitiful than the first try, this time, I didn't even get to get stuck! My blood pressure was 75/49 (way too low to donate, or even function), so I was sent away, and none the less with free tickets to see Penn & Teller. I suppose I'll go back again, if not to be a good Samaritan, or because of the incessant calls from United Blood Services, but at least so I don't feel like a thief for getting free tickets.