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, three males, two females,” he replied.
Intrigued, she asked, “How can you tell their gender?”
He responded, “Well, three were on a beer can and two were on the phone.”