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, three males, two females," he replied. Intrigued, she asked: "How can you tell the sex of a fly?" He responded: "Well, three were on a beer can, two were on the phone."
regards,
Hein