It seems that I'm always late finding things out, but I thought this was fascinating, even though it sounded at first like an urban legend.
I was sitting around with some friends this weekend when one of them asked outloud, "Hey, when is passover?" A silence came over the room of gentiles.
He then explained that, once a year, Coke makes their soda available with sugar and not high-fucktose corn syrup. The reason for this is that high fucktose corn syrup is not kosher.
How do you find the original stuff? The bottles will have yellow caps on them.
One other thing: Coke is still available with real sugar in Mexico. And they say Americans have everything.
You can read a lot more about it here. It's fascinating and juicy all at once.