A woman arrives in the kitchen and sees her husband with a fly swatter and asks,

“What are you doing?”

He replies, “I’m chasing the flies.”

She asks, “Did you kill them?”

He says “Yes, 3 of them were males and the 2 females”

She asks him, “How do you know it?”

He answers, “3 were on the beer can, 2 on the phone.”