A woman walked into the kitchen to find her husband stalking around with a fly swatter.

"What are you doing?" She asks.

"Hunting Flies, He responds.

"Oh. Killing any," She asks.

"Yep, 3 males, 2 Females," he replies.

Intrigued, she asks, "How can you tell them apart?"

To which he responds, "3 were on a beer can, 2 were on the phone."