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

"What are you doing?" She asked.
"Hunting Flies" He responded.
"Oh!, Killing any?" She asked.
"Yep, 3 males, 2 Females", he replied.

Intrigued, she asked. "How can you tell?"

"3 were on a beer can, 2 were on the phone".