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, 3 males, 2 females,' he replied.
Intrigued, she asked. 'How can you tell them apart?'
He responded: "3 were on a beer can, 2 were on the phone".