Yes, this is the fastest hot tub (that we know of).

A 1969 Cadillac DeVille was turned into a mobile hot tub by two engineers with way too much time on their hands.

They named the vehicle...wait for it...the Carpool DeVille.

I have one question.

Shouldn't brilliant engineers be working on something for the benefit of mankind rather than a way for them to possibly get laid? :-D