Comment by dmoy

For anyone else like me who hasn't read Kurt Vonnegut, but does know about different ice states (e.g. Ice IX):

"Ice Nine" is a fictional assassination device that makes you turn into ice after consuming ice (?) https://en.m.wikipedia.org/wiki/Ice-nine

"Ice IX" (ice nine) is Ice III at a low enough temperature and high enough pressure to be proton-ordered https://en.m.wikipedia.org/wiki/Phases_of_ice#Known_phases

So here, Sam Altman is stating a death threat.