Salt and ice challenge - Wikipedia
File:Christmas Ice Rink, Kew Gardens - geograph.org.uk - 296102.jpg - Wikipedia
Ice bath / Cold Water Plunge
The Wikipedia page on cooling baths seems to be particularly excited about using aniline and liquid N2 : r/chemistry
Ice bath - Wikipedia
Ice - Wikipedia
Sitz bath - Wikipedia
File:Brad in ice Closeup.jpg - Wikipedia
Ice Cream Bus, Junji Ito Wiki
Ice bath - Wikipedia