If you ever owned an old flathead Ford, and had to stop for a signal, you would probably put your foot on the clutch, put your other foot on the break, and leave it in gear. However when you popped the clutch, meaning you took your foot off the clutch, there was a fair chance you would leap forward and stall the engine. Then when you tried to start it you might find you flood the engine. This could be a death wish in this circumstance. As I managed to have this experience, and then had nightmares about it.