The Mpemba effect is the observation that, in certain specific circumstances, warmer water freezes faster than colder water. New Scientist recommends starting the experiment with containers at 35 °C (95 °F) and 5 °C (41 °F) to maximize the effect.[1]
^^^ this reminds me of a winter I lived on my boat. One morning it was fricken freezing and I hawked a loogie onto the dock and while it didn't freeze solid, it was certainly slush by the time it hit the ground......