Instant hot ice.
Fun with Sodium acetate {wiki} in a supersaturated solution, which becomes exothermic (releases heat) when it crystallizes. Push play or go to YouTube. -via Dark Roasted Blend
I thought of ice-nine too! Especially when he touched the cup to the tower and it spread to the water inside as well!
Vonnegut was a visionary, as well as a philosopher and storyteller.
Glad to see other fans of Vonnegut also thought of Ice-Nine when they saw this.
@ Lala,
It’s an exothermic reaction meaning it gives off or releases heat. So it would be hotter than the surrounding environment.

