>>931317>fall at 20kmh>hit head on curbYou can die. It's actually a likely scenario. Had a cop friend see some fuck on a scooter just slip from almost standstill (so, 20kmh or slower) and hit his head square on the curb. Died on the spot.
If you don't die there's a pretty good chance you'll be a vegetable/retarded/suffer from light brain damage which will have all sorts of fun side effects, like panic attacks for the rest of your life.
>hit leg/armWorst case scenario you break it and it's bad but shit happens. You can possibly die from a very bad exposed fracture but to get one of those you need to be unlucky, and going pretty fast.
So this is why helmets are important and people see a point in wearing them.
I'm looking to buy one soon, just evaluating the market as I'm a newb.