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?' 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.

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