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.