I illustrate the aphorism thusly: at the drive-thru this afternoon at Burger King, I was given too much change ($7.00 – $6.12 ≠ $0.93, even in my world of half-learned arithmetic), so I gave the extra nickel back to the cashier; when I get home, I find out that I ended up with a Whopper, complete with green crap that might have been lettuce in a former life, instead of a BK Double Stacker, which doesn’t come with that crap on it, and has tasty bacon to boot.

Now, given the whole Schrödinger’s cat business, if I’d not have given the change back would I have ended up with the meal I was supposed to get? Probably not, since the receipt also listed the Whopper instead of the BK Double Stacker… but we’ll never know, especially since I didn’t look at the receipt until after I returned the nickel.