Each week Bostonist scours the internet for the most viral of Boston-based videos for your LOL-ing pleasure. This week's entry takes us over the river to Central Square where "Art Genius Master Carr" takes innocent passersby on a free art tour of the alleyway outside Central Kitchen. While the real story behind this awesome mural is a bit different than Master Carr presents it, listening to him describe his "pink flower period" and how he......