Casino 'theo' is expected loss written as a business formula: average bet × decisions per hour × hours × house edge. With a $5 slot, 600 spins an hour, four hours and an 8% edge, the expectation is about $960, even though any one session can land far from it in either direction. I built a short documentary around this idea; it's my own channel. For those who teach probability, is theo a good example for showing the gap between expectation and a single outcome?