Some people just aren’t the brightest bulbs in the drawer or the sharpest tools in the shed. Coming into contact with a clueless person can range from incredibly frustrating to absolutely hilarious, and no one knows that better than these Redditors who witnessed stupidity so intense, they had to wonder “how the heck didn’t they know that?” 1. Drumstick DummyThis one blew my mind. My housemate, a 24-year-old post-grad student, did not realize that: 1. You needed to preheat an oven. 2. You needed to defrost frozen meat before cooking it. 3. You need to use a baking tray. I learned this one day a…