Cambridge Police busted a dangerous criminal last night. Well, a guy drawing a smiley face in chalk outside the Harvard Square T stop, at any rate.

Jiffywoob reports Cambridge cops detained him for 25 minutes while they waited for an MBTA cop to show up to determine what to do about his wanton disregard for the law:

What's really weird is that as I was being detained, I saw right nearby a guy chugging a Natty Light in plain view and a guy chugging a Heineken in plain view. And smelled the sweet aroma of our friend Mary Jane. What did Officer Anti-Punk do? Continue holding me for drawing a f*cking smiley face. ...

He does not say if the officers took 27 eight-by-ten color glossy pictures with circles and arrows and a paragraph on the back of each one. However, the T cop was "wicked cool" and let him go.

Beantown Chalk Monsters exists to encourage people to make public art on the sidewalk in chalk.

The streets of Boston and its environs are in desperate need of decoration. When people become isolated and don't notice their surroundings, they miss out on a lot of beauty and joy in the world.

Jiffywoob, who helped start the thing, was appropriately impressed by the chalk drawings in front of the Boylston T stop last night.