You may remember reading several years ago about a pair of polite gunmen with British or Australian accents who were robbing homeowners in moneyed neighborhoods of suburban Montgomery County, Md. The masked duo struck several times, usually entering the homes through the garage or unlocked doors. The intruders were unfailingly polite and as far as we know, no one was hurt.

One homeowner in Potomac, Md., was robbed after letting his dogs outside at about 5:30 a.m. and leaving a sliding glass door unlocked. Instead of the dogs coming back in, the homeowner was confronted by one of the robbers, who pointed a gun at his head. The gunman "was quite polite throughout the whole episode," the homeowner, who asked not to be identified, told THE WASHINGTON POST. "We got into a conversation as if he w…