[FirmwareBurner]

Well yeah, they were an entertainment show, not a research institute but I doubt you'll find anyone refuting their find though.

It's a known fact better looking people get treated better by their fellow clothed apes in all walks of life, including and especially, service industry work.

[simbolit]

I am not objecting to the finding or the show, I am objecting to the casual use of "prove" where something has merely been plausibly suggested.

[AlbertCory]

Correct. Things can be disproved by a counterexample, but not proved.

A theory that "tips are always determined only by service quality" is indeed disproved by Myth Busters. But that's not what he said.