Mike Konkoleski, a 10th grade math teacher at Eric Solorio Academy High School, was identified as the man behind the audacious assault on Chicago mayor Rahm Emanuel's character in the form of a protest sign declaring Emanuel a fan of Nickelback.

There's no telling how long the Chicago Teachers Union strike — the first strike of its kind in the city in a quarter-century — will last, but, as this photo clearly shows, the protests have already taken a turn for the dirty.