Today, I took two crumpets out of the freezer, which had become stuck to each other where moisture between them had frozen. They were two separate crumpets, the top one stuck fast to the bottom one, so they didn't go into the freezer attached to each other in any way.
And it made me wonder, what causes the crumpets to become stuck? Why don't you just have a crumpet, a thin sheet of ice, and then the other crumpet? What's going on at the chemical level that explains why these two crumpets became stuck to one another?