My first thought. Has anyone been tracking stuff that started as xkcd comics? I only recall a couple: self referential chart, Facebook group of million users, M

My first thought. Has anyone been tracking stuff that started as xkcd comics? I only recall a couple: self referential chart, Facebook group of million users, MBR love note, people playing chess on roller-coasters, sudo make me a sandwitch robot… Looks like http://en.wikipedia.org/wiki/Xkcd#Inspired_activities http://en.wikipedia.org/wiki/Xkcd#Inspired_activities is missing some.