Fact
Superfluid helium climbs out of its own container
Cooled far enough, it flows with no viscosity and creeps up the walls.
Below about 2.17 kelvin, liquid helium-4 becomes a superfluid with zero viscosity. It forms a thin film that climbs container walls and siphons itself out over the rim, and will flow through gaps too small for any ordinary liquid. It is one of the few macroscopic quantum effects you can watch directly.