I snapped (sorry for the crappy night time camera phone photo) this one parked up in a bike rack in Copenhagen. For reference Mrs C is 5'9" & those are 700c wheels! I was staying in a hotel around the corner and kept an eye out to see what sort of height you'd need to be to swing your leg over it but sadly never saw them. Check out the "normal" bikes in the background - bonkers!
Spotted any others that are just crazy dimensions?