Luke's Feet
When Luke was hanging upside down in the Wampa's cave, his feet were apparently frozen over or stuck to, the ceiling. When he used his saber, he gave one quick swing and suddenly his feet drop free. Since lightsabers don't give off heat, it couldn't have flash-melted it, and you wouldn't think one, barely aimed swing would cut through ice so precisely as to miss his feet. Is there something else behind this amazing feat?