MythBusters Laws of Attraction

The boys test the correlation between large breasts and how much men tip, by having the same woman wear the same clothes, hair & makeup, only changing her bra size from small to D to DDD. At the end, they are surprised that men tipped pretty much the same, but women tipped 40% more. However, their test is completely invalid: they forgot to take into consideration that they were in a coffee house located in San Francisco. (They said so at the beginning only.) If they had done their experiment in a normal city, the results would have been much more normal, as in women tipping that female barista close to nothing at all.