there was one ages ago that was funny
i think a researcher or something is looking at both diet coke and diet pepsi (or maybe it was coke and diet coke) under a microscope
in the one there is a guy laying on a lawnchair sipping drink #1
then they look at drink #2 and they see the same thing
the researchers looks up and says "just as we suspected, no difference"
just as he says it, in drink #2 a half naked girl comes walking around the corner with a pushmower, while the guy just lays on his lawnchair sipping whatever they are trying to sell us