Late Friday night, some guy in an apartment in the area of Nazing Street in Roxbury turned on his new Macbook Air - and it promptly took this photo and e-mailed it to the Jamaica Plain man from whom it was stolen on Wednesday.

A Boston Police report shows the man was jumped from behind and knocked to the ground around 6:30 p.m. on St. John Street.

Eric Herot, a friend of the victim who posted the photo to Twitter, reports the two muggers held him there long enough to grab his phone - on which he was talking when attacked - and his computer bag.

Herot says his friend had installed software called Prey on the laptop, which is designed for just such events. Once activated, the software periodically and quickly turns on a laptop's camera, takes a picture and then mails it to the owner, along with an approximate geographic location and information about its connection to the Internet (the laptop's connecting via a wireless network called LADYFEENIX-PC_Network_1).

So if you're in the Nazing Street area and know a guy with the text of John 3:16 tattooed on his chest, you might want to suggest he drop that laptop off at, oh, District B-2. Herot says his friend doesn't think this guy was one of his attackers.