In this day and age we are always losing things, especially keys and wallets. It's practically unavoidable. Fortunately, somebody recognized this as a problem and invented this:
This is a device that you can attach to both your wallet and your keys so that you can locate one with the other. It really is quite a brilliant idea for people who are always misplacing one or the other.
Unfortunately, I am not one of those people, and I have lost my wallet AND my keys, proving that most handy inventions are pretty futile if you're a big enough dipstick.
Thus inventing is set back another few years.
... If anybody could find my wallet or keys, that'd be really great. I really need them so I can drive and buy stuff...