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xkcd #2929: Good and Bad Ideas
(imgs.xkcd.com)
Alt text:
While it seemed like a fun prank at the time, I realize my prank fire extinguishers full of leaded gasoline were a mistake.
Yeah, it's still practiced. But the whole four humors thing is a bit old hat.
I think there's a few of these misplaced. Heelys>transition lens.
And also often in such cases, blood donation is suggested instead.
I dunno, seems kinda unrelated..