Quote:
Originally Posted by Savage_Messiah
Last time I gave blood I almost passed out. That's what I get for having like 5 hrs of sleep, then having just a donut on my way to the blood drive. Lesson learned  . Actually I wasn't laughing at the time, it was a really strange, bad feeling. I barely got out "stop" while I had enough breath to speak.
Lesson learned. 
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thats only because instead of 9 quarts your body only has 5. so taking a full quart from you is like 20% of your total blood capacity.