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Anonymous B joined in and replied with this 13 years ago, 12 minutes later[^][v]#442,826
Generally blood is flowing out of an open wound. Maybe if you found a hat with some AIDS infected bodily fluid inside it and then rubbed it vigorously into the wound on your head...
tl;dr: probably no.
Anonymous C joined in and replied with this 13 years ago, 29 minutes later, 41 minutes after the original post[^][v]#442,828
Have you had intercourse with the hat?
Anonymous D joined in and replied with this 13 years ago, 1 minute later, 42 minutes after the original post[^][v]#442,829
If HIV were on the hat, it would not survive but a couple of minutes in the open air. No worries, mate.
Anonymous E joined in and replied with this 13 years ago, 2 minutes later, 45 minutes after the original post[^][v]#442,831
Yes, but you can get lice.
Anonymous B replied with this 13 years ago, 6 hours later, 7 hours after the original post[^][v]#442,866