Crochet graffiti, or yarn bombing, is arguably the newest trend in grafitti. But while traditional graffiti is highly illegal and causes all sorts of permanent damage, this new trend is far less harmful and not as frowned upon. Instead of paint and spray cans, they use yarn and needles to canvas the streets in their colorful creations. Hydrants, lampposts, mailboxes, bicycles, cars — even objects as big as buses and bridges — have all been bombed in recent years, ever so softly and usually at night. A Canadian knitter even declared June 11 International Yarn Bombing Day on Facebook! You better watch out for these renegade knitters, and hope they bomb something near you!