Having a car in Amsterdam can be a real pain in the *ss. Sometimes it seems a boat would be more useful in the summer months. No traffic jams along the canals and a lot of fun during Queensday. A bit of both would come in handy though.
This type 166 "Schwimmwagen" was used by the Germans in WWII. It is the most mass-produced amphibious vehicle ever. The design looks like an army bath tub on wheels. Really cool. The black colorway seen above is way better than the camouflage. (Pictures via Serious Wheels)