A woman walked into the kitchen and saw her husband stalking around with a fly swatter.
"What are you doing" she asked.
"Hunting flies" he responded.
"So...how many have you killed ?" she asked.
"So far three males and two females" he replied.
Intrigued, she asked "so how can you tell ?"
He respond, "three were on a beer can and two were on the phone"