I keep trying to wean myself from blogging about weird goings on in and around Golden Gate Park — but I found it hard to resist this one. I was walking down the block just the other day and saw some guy asking people to smoke his thumb. Indeed, when I looked closely, I could see a plume of smoke rising up from beneath his thumb. One person actually stopped and smoked it, and then the guy started smoking his own thumb. Eventually, the (presumably illicit) contents of his thumb burned down and singed the inside of his finger. “Ow,” he said, and the demonstration was over.