I'll be honest, I've never seen anything like this before, but the Mini Shorty convertible seems to be a mini-version of a Mini – if that's possible.
Built in the 80s and packing a 998cc engine and a more recently-added soft top, the Mini Shorty was built by a professional company making these down in Cornwall and used originally as a demo car, but latterly as the current owner's 'personal fun car'. How small? I can't say exactly, but the images on the site might give an idea of size compared to other vehicles.
Guaranteed to turn heads, it's good to go with a hefty MOT, new tyres, a new 'reconditioned' engine less than 10,000 miles ago and offered in 'fabulous condition' overall. If you want it, the bids are currently at £1,500.