I've heard of people getting in trouble around here for riding their bike drunk, but I have no first hand knowledge of it happening.
Perhaps young kids were drinking and riding the scooter around like idiots and this allows them to punish them for more then just underage drinking?
You'd think a horse would be a little dangerous with a drunk at the reigns, at least more so then a scooter. And a lawnmower? Do these laws apply to you even if you're on your own property? Well, at least I still can get drunk and mow the lawn.