Determining 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?" He responded, "3 were on a beer can, 2 were on the phone".

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