How to Tell the Sex of a Fly

How to Tell the Sex of a Fly JUST TOO CUTE. This is the cleanest E-mail joke I've come across in a long while! 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."