Yeah that will be liquid nitrogen that does that to rubber balls. Liquid Nitrogen is usually at 77 Kelvin which is mighty chilly. (Room temp is at 298 Kelvin, 1 deg C = 1 K).
An interesting thing I saw done once, was to take a rubber mould, pour some wine in it, add a stick, dip in liquid N2, shatter the rubber. Voila, instant wine ice lollies.
It would work equally as well for vodka, whisky. The ability to completely freeze alcohol.
How does one make a cat bark like a dog. Does it involve a firework?
Jay