Do you remember the Bubble Car? I know it was made in the 1950s, but there are still a few models that can be seen out and about on the road.
The egg-shaped three-wheeler was powered by a small motorcycle 236cc engine. The only access in and out of the things was by the one door at the front. As far as I know, the early models did not have a reverse gear, so going back wasn’t going to happen unless you got out and pushed it. This must-have caused a few problems over the years for some unfortunate owners.
There must have been a few owners who drove home in these bubbletastic bubble cars, straight up the driveway and into the garage. Stopping at the far end against the boundary wall, handbrake on and then realising they can’t open the door to get out! No worries, just reverse enough to leave room to open the door. Uh oh!!! No reverse. Imagine the feeling when it dawns on you that you are trapped in this three-wheeled chariot. Especially if you were living alone.
There were no mobile phones in those days, so you were well and truly up s**t creek without a paddle. I suppose this is one of the reasons they fitted the later models with a reverse gear. Some people could have been trapped for days on end and dare I say it, some were never found at all until it was too late. What an awful way to go. Just remember, if you decide to buy one of these little bubble cars, make sure you get one with a reverse gear. You can thank me later.
Here is a Wikipedia page on the Isetta Bubble Car.