Rather famous game in the CFL. There'd been a rain, and a freeze. They club put an antifreeze on the water, but it got REALLY cold and it froze too, leading not just to ice, but to greasy ice. People would take a while getting up to speed, but with the ability to change direction being almost nil it was hard to intercept, so they could get long runs going. When people were tackled they were literally sliding along the field for twenty yards; you'd see big wriggling masses of players sliding one way or another on the field as the energy from the various collisions affected the trajectory. It was a sight to behold.