I confess to having had the engine go silent on a 150 after lining up. Pushed the throttle in too fast. Embarrasing to have to tell the tower, but it started first try and I was more careful afterwards.
C150's will ice if you look at them wrong. Carb heat goes on just before I throttle back and reconfigure for landing. It stays on till about 300-250 feet which is when I take a decision that my approach is good enough to land. - that is if I remember it!