Lanfranc: I can't make "zero degrees Kelvin" scan to the usual tune. Anyway, to be an up-to-date smartarse you should make it "zero kelvins"; current official style is to treat the kelvin like other units. That doesn't scan at all, of course, but you could sing "When it got down to zero kelvins".
IMO, however, a song that is already anatomically, meteorologically, geologically, and astronomically impossible may perfectly well go on to violate the third law of thermodynamics.
--- Joe Fineman email@example.com
||: Entities exist promiscuously. :||