Kate calls herself the Grammar Vandal and goes around with a pad of sticky commas/apostrophes to put on local signs that need them. She reports how this recently got her into a spot of trouble with Tufts police, who didn't take kindly to her (or the tall guy who agreed to help her) adding an apostrophe to a sign reading "Professors Row:"
... Cop (yelling): "What are you doing?"
Me: "Just fixing the sign."
Cop: "What are you doing to it?!"
Me: "Officer, this is incorrect grammar. Oh, and I don't even know this guy! I pulled him off the street!" ...
Via J's Scratchpad.