So I heard you like cheese is a commonly-used catchphrase by many people. Many people who use it eventually lose their sanity. It is unknown how it makes people lose their sanity, but there are currently two main possibilities.
1. The word's order somehow makes the brain malfunction until many brain cells die, making the person mentally insane.
2. People who say it are already insane, but insane in a way that makes them say this strange sentence.
People who say it who aren't insane usually say it as a joke, to annoy someone, or they actually want to know.
Person 1: So I heard you like cheese.
Person 2: Yeah, why do you ask?
Person 1: (Brain Malfunctions) Cheese shall rule the world and kill us for eating their children!
Person 2: He's insane.
Person 3: So I heard you like cheese.
Person 2: I think you're insane.
Person 3: No, I just want to annoy you.