How to Tell the Sex of a Fly
A woman walked into the kitchen to find her husband stalking around with a fly swatter.
"What are you doing?"
"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?"
"3 were on a beer can,
2 were on the phone."