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," he replied.

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

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