Police are asking Upper East Siders to be on the lookout for a knife-wielding mugger suspected in a string of robberies in the neighborhood over the past week. The first is believed to have occurred at 12:45 a.m. on September 4th, when the perp—described as a mustachioed black male, between the ages of 35 and 40, about 5-foot-10 and 190 pounds—relieved a 32-year-old man of his wallet and cellphone.

That job netted a cool $60, and, so emboldened, the rogue struck again less than 24 hours later, in the lobby of an 83rd Street building. But he got more than he bargained for from 29-year-old Nathan Perilo, who fought back to keep his wallet, which contained the princely sum of $6. Watch them chase each other up and down the stairs in this surveillance video, which could really benefit from that Benny Hill theme music ("Yakety Sax"):

For his trouble, Perilo got his pants torn off and sustained a minor laceration on one leg. He concedes to the Post, "It wasn't the smartest thing to do. You feel taken advantage of, and I have a problem taking things laying down." He says he wasn't fighting for the $6, but for other irreplaceable "stuff" in the wallet.

The suspect had an easier time on September 8th, when he robbed a 43-year-old man near Second Avenue and 75th Street at 10:30 p.m., making off with a wallet containing about $150. And on the 9th, at 2:30 a.m., he mugged two men, ages 25 and 57, on Third Avenue and 80th Street, fleeing with about $200. No one was injured and no trou was dropped during those incidents.