Electric cars.

It didn't do too badly at first here in the UK. Quite cheap, no licence needed, no road tax and no insurance because it came under the pedal cycle regulations as it weighed less than (I think) 130lb and the battery was less than 250w. I seem to remember that they sold about 10,000 in the first six months. The first Tesla sold about 150 in its first year and if it ran out of charge you couldn't move it by pedal power

 

There is no way they sold that many C5s! It was a pile of cack from start to finish, it tried to satisfy multiple markets and missed in every respect
It's done nicely in niche reselling though, for those quirky enthusiasts

 

Just checked. They made 14,000 but only sold 5,000 in the first year. Don't know how many of the other 9,000 were sold later to the enthusiasts.

I remember seeing a lot of them around the West End 40 years ago.