I liked that one. We’ve used binder clips for all sorts of things.
The nail polish on keys reminded me: my brother got tired of me forgetting which nondescript key opened his house, so he had a key made with a pirate skull on it, so it would stick out on my ‘ring-O-many-keys’.
When you go to have keys made, you can choose between many different designs, and that will help you remember which key goes where; and the identifier doesn’t wear off like nail polish does.
(I wish he’d given me the typical big-eyed ‘alien’, instead of a pirate skull, though. I’m sorta into UFOs and Aliens - just as an anthropological study, you understand... ;-)
Seldom have a challenge w/keys. The idea of using the tabs from the purchased bread wrapping was one which struck home. Using these on the cord at the socket to distinguish what plug is for which appliance. BTW, UFOs and Aliens (outer space) always holds my interest. At one time X-Files was a show not to be missed!
Not remembered, the exact video regarding plastic soda bottles; but, there was one idea which gave instructions to transform the bottle into an egg separator. It easily sucked up the yolk which was then squeezed into a bowl, leaving the whites in the first bowl. Kitchen accessories to outside play tools - making a children’s sprinkler out of a bottle. The spoon idea was one for MacGyver :-)