You don't hear much about bullvalene, outside of physical organic chemistry textbooks. It's a funny-looking symmetric tricyclic compound, which just seems to be another weirdo hydrocarbon until you consider what it can do with all those alkenes. Everything is lined up just right to rearrange - and then the product you get is lined up just right to rearrange, which gives you a product that rearranges, and so on and so on. The molecule has no permanent structure at reasonable temperatures; this process never stops.
We owe William von E. Doering and Wolfgang Roth for this one (the background story is here). I hadn't realized that the "bull" in the name was put in there by Doering's grad students - it was his nickname! (Believe me, there are a lot of research groups out there where that trick...
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