This one has been going around for a long time, but I've never seen it on TV before. You should watch this -- it's only a minute or so, and it explains a great deal about the Middle East: (h/t @maxstrasser, via Twitter)

The joke (apart from the obvious joke) is that Pepsi gained a serious reputation among pro-Israel people in the 1970s for participating in the Arab economic boycott of Israel. Which is why today, Israel is basically a Coke-centered country.