A man was in the kitchen making a lot of noise! His wife comes in and asks why he was making so much noise? The man replies: "I am killing flies."

A short time later his wife came back and he was still making lot of noise! She asks: "Well, Mr. Big Shot, how many flies have you killed?"

He says: "I have killed seven flies! 4 males and 3 females."

She says: "Right, how can you tell the gender of flies?"

He says: "Very easy: the 4 flies in my right hand are males. When I killed them, they were all on beer cans!" Then she asks: "If you are so smart, how can you tell the gender of the females?"

He says: "The three in my left hand, they were all on the phone!!!"