This law of nature states that if you see a gross bug in your room and it crawls out of sight, it could be anywhere in the room. It follows that there is a significant possibility it could be about to crawl onto you, and this fact will eventually freak you out.
Borrowed from the Heisenberg Uncertainty Principle, which states that both the position and momentum of an electron cannot be known.
Person A: "Joe is such a man slut."
Person B: "He sounds like a completely typical guy."
Person A: "He is. I bet the person who made the entry for slut didn't think of that."
Person B: "I guess not. That is pretty fucking clever though."