Blood donating. Giving out a pint of blood. All I know is it's a free pass to heaven. I'm on the moral high ground.
Donate a few gallons instead. It will get you to heaven even faster...but not in the way you're thinking of.
I try donating plasma when I'm low on cash lol That's the problem I ran into. Apparently there's a decent sized vein but it's below a small vein and they'd have to go through the small vein, which isn't safe at all. I've stopped going because I've gotten so nervous lol