One of the local losers that lived in the duplex across from my office got himself one of those mini electric choppers a few years back. He'd ride it up and down the street in front of my place. That really wasn't an issue until he started doing it on the sidewalk right outside my front door. He didn't take the hint the first couple of times I asked him to desist citing the accident potential.
On his third foray, I opened the door at the appropriate time.