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How to tell the sex of a fly ...

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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."