I've been triggered:
https://www.cartalk.com/radio/show/1343-hold-cream-rinse#Car Talk: cream rinse or no?
go to site and click on "BEST MOMENT"
Raymond takes on the challenge, whilst his brother Tom is dissolved into a puddle of laughter. It seemed funnier at 5am on the way to the ski mountains, but I can't hear "shampoo" or "cream rinse" without thinking of Click and Clack the tappet brothers (MIT grads).
Oh and yes I am reading this tread because I am shopping for a Dream Edition now that they are available.