Shelia walked into the kitchen to find her husband, Fred, stalking around with a fly swatter.

"And what are we doing?" she asked.

"Hunting flies" he responded.

"Oh? Killing any?" she asked, with a smirk.

"Yep! Got 4 males, 3 Females," he replied.

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

"Simple." He replied, "4 were on a beer can, 3 were on the phone."