Not so fast, would-be bike thief! The people at WCG in San Francisco had their crime watch binoculars on and were able to thwart the attempts of a preppy-looking crook.

Video shows a female running in front of the thief, who was clumsily trying to make his getaway on the bike, and knocking him from the seat. The goon regains his balance and makes his escape, this time on foot.

No word yet on whether or not the brazen burgler has been caught or if the heroic designer keeps a cape at her desk.

juliachan@sfexaminer.com