Flies

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 and 2 females" he replied. Intrigued, she asked, "How can you tell?" He responded, "3 were on a beer can and 2 were on the phone."