People who hit their kids to discipline them are unimaginative at best. Better to mess with their minds and coax them to behave the way you want them to out of fear, the prime motivator for humankind. "Get over here or I'll spank you" is nowhere near as effective as "Get over here or aliens will trap you and take you away as you sleep."
If you hit a kid, you're only teaching them that brutality solves problems. But if you tell them crazy stories, you're teaching them to be creative and that you can get your way with empty threats. It's a lesson that will serve them well.