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.