A woman walks into the kitchen to find her husband stalking around with a fly swatter.
"What are you doing?" She asks.
"Hunting Flies" He responds.
"Oh, are you killing any?" She says.
"Yep, 3 males, 2 Females," he replies.
Intrigued, she asks. "How can you tell the males from the females?"
He responds, "3 were on a beer can, 2 were on the phone."