Toothpaste tube theory

The toothpaste tube theory is a jocular metaphor stating that increasing pressure eventually forces some sort of release, just as when one squeezes a toothpaste tube, toothpaste comes out. It is used to explain social and political behavior, as well as relationships involving abstract concepts. Moreover, it is often used in metaphors to describe irreversible processes, since getting toothpaste out of a tube is easy, while reinserting it back into the tube is next to impossible.