The trouble with kids is that they just don't have enough ways to injure themselves these days.
If you're a parent who thinks this should change, then we can't think of anything with better arm-breaking potential than the Crazy Cart from Razor.
What the Crazy Cart is, is a shrunken electric go-kart on casters with a tiny seat and a vertically-mounted steering wheel. Or that's what it looks like, at any rate.
What it does is allow kids (or suitably light adults who haven't yet stopped acting like kids) to pull enormous drifts or dizzying spins using an e-brake-like lever beside the seat. This lever varies the rear caster angle to send the Crazy Cart sideways at every opportunity.
It's recommended (well, not recommended, but suitable) for kids aged 9 and up, with a maximum weight of 140 pounds. We suspect you also have to be relatively slight too, since only smaller adults and children would realistically fit onto the lunch tray-like dimensions.
The Crazy Cart uses two 12-volt lead acid batteries to supply power, while speeds of up to 12 mph are possible before the inevitable pile-up involving the neighbor's prized flower arrangements / dog / ankles (delete as appropriate).
There's also enough juice for around 40 minutes of running, provided your kid doesn't crash in the first five minutes and never touch it again due to flashbacks.
Flippancy aside, it looks insanely awesome and every man, woman and child in America should have one. Stress would be a thing of the past, and nobody would ever again call electric vehicles "boring".
It's also a bargain. Okay, so $399.99 isn't cheap for a kid's toy, but it's cheaper than a Tesla Roadster, which is the only electric vehicle that'd come close to being as fun as one of these things.
There needs to be an adult version. Shut up and take my money!