Riddle: a detective walked up to a door. before he went inside, he heard: "NO BOB! DONT!" the there was a large BANG! well, the detective ran inside the door, to find a plumber, an electrician, and a traveling salesman. there was also a dead woman on the floor with a gun beside her. the detective immediately arrested the traveling salesman. how did he know it was the traveling salesman that killed the woman?
Answer: the plumber and the electrician were girls