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