Tire Indicator
If you've never done the penny trick to check the wear on your tires, you can also just look for the indicator. There's a little button that pops out when it's time to have your tires changed. Much easier than digging around for change.
Game Cartridge Flavor
It's no secret that kids put literally everything in their mouths. Those tiny game cartridgers that come with consoles are choking hazards, so they're covered in a bitter film that tastes gross when put in a kid's mouth. That should deter them from biting down on anything they shouldn't.