A woman walked into the kitchen to find her husband stalking around with a fly swatter.
she: "What are you doing?"
he: "Hunting Flies"
she: "Oh. Killing any?"
he: "Yep, 3 males, 2 Females,"
she: Intrigued, "How can you tell them apart?"
he: "3 were on a beer can, 2 were on the phone."