(One of my coworkers was not the brightest bulb in the box. He comes in one day with some leftovers in a paper box that has a metal handle. He puts it in the store’s industrial microwave and walks away. When I smell smoke, I rush over to the microwave as my coworker comes back over.)

Coworker: “What’s going on?”

Me: “You put metal in the microwave.”

Coworker: “So?”

Me: “You aren’t supposed to do that.”

Coworker: “I’m not?”

Me: “Haven’t you ever heard you don’t put metal in the microwave?”

Coworker: “No?”

Me: “…Okay, you’re not allowed to use the microwave anymore.”

Related:
If You Can’t Stand The Heat, Stay Out Of The Microwave