Swing your partners

This year's Nobel Prize in Chemistry goes to three scientists for a chemical process that the Royal Swedish Academy of Sciences press release compares to a "change-your-parteners dance." To quote the press release further,

The word metathesis means 'change-places'. In metathesis reactions, double bonds are broken and made between carbon atoms in ways that cause atom groups to change places. This happens with the assistance of special catalyst molecules. Metathesis can be compared to a dance in which the couples change partners.

The web page includes a goofy flash animation of the process. I guess catalyst pairs have dreadlocks.