Still in the “mad science” vein, here’s something that really exists (but only just):
It’s an electric-powered scooter. And it still does have two wheels – they’re just side by side, instead of that stuffy old “one in front of the other” thing.
It’s toally simple to drive – once you get it balanced. Reassured, everyone?
It’s battery powered and can reach about 60 kilometres an hour. And that’s just the prototype.