I’ve figured out the perfect crime for me to commit. It’s counterfeiting two-dollar (United States) bills and spending them (in the United States). Any cashier questioning the bills would go asking around and get told by some smug know-it-all legal tender pedant — there’s at least one in every store’s work shift — that there are so two-dollar bills, and while they’re rare they’re legitimate currency and you should feel stupid for not taking them, and maybe they’ll even point out those urban legends about Taco Bell giving you stuff (Taco Bell food) for free just to not bother them with two-dollar bills or how the mall’s cops laugh at people who think two-dollar bills are fakes. I don’t care about getting free Taco Bell food, but the principle is a good one.
Why this is really perfect is it’s perfect pedantry snipe bait: anyone ready to get all smug about knowing there are so two-dollar bills is going to be so busy showing how proud he is to accept them that he won’t suspect they’re fake. And if he does accept them and find they’re fake, he won’t tell anyone because it would be too humiliating to have his smug self-assurance of knowing that two-dollar bills are for real destroyed by turning them over to people who know that these two-dollar bills are not. By then, I’m long out of the store and have got my free books about Taco Bell.
Oh, except it wouldn’t work, because I’m a know-it-all legal tender pedant and so I know that I’d be unable to resist going back to the store and telling the legal tender pedant just how I put it over on him. And then he’d either turn me in or demand to be cut in on the scheme because it’s so good. So the whole thing is a failure. Now I can’t do anything with the idea. Too bad.