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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. "Killing any?", she asked. "Yep, 3 males, 2 females", he replied. Intrigued, she asked, "how can you tell their sex?" He responded, "3 were on a beer can, 2 were on the phone."