Interesting and Unusual Bikes You've Seen

[grams]

Disc mount is far too proper. They come with a ring (in two halves) that clamps the sprocket to the spokes, because everything about them is a horrible bodge.

I presume in this country they're bought for fun / teenage dickery rather than useful commuting function, though there may be some part of the world where they're actual transport.

[Cudzoziemiec]

This one seemed to be on student commuting duty, though of course that in no way precludes teenage dickery.

[MattH]

And, of course, blatantly illegal (unless the owner has gone through a lot of hoops and got it registered as a moped with a numberplate, insurance etc).
No excuse for the police not to stop that for a look,  whereas an iffy electric bike is a bit more work to show it is illegal.