"No rich person would ever take a $20 bill and say, yeah, I want to carry this around. Like zero people will do that," he says. "So I don't throw away the coupon. Let's say I put it in my car ... That's pretty smart, right? Put it in your car, drive to Bed Bath and Beyond,. Take it out of your glove compartment... And that's the first time you notice it's expired."