I am awake now on my day off because a neighbor has one. Stupid noisy things. I don't know how many times I've laughed at adults riding these along footpaths.
I saw a guy riding one on the road at night, he was crossing a pretty busy intersection with traffic lights. He had a bike helmet on and was riding beside a ute crossing the same road, he couldn't control it properly and actually leant on the tray of the ute while doing about 40k. Soo stupid. I could see his head exploding under the exposed wheel of the ute, like that bicycle helmet was going to do anything. Probably the last thing i'd give my kids (if i had any).