Convoluted

Kellie the babysitter sold the kids on ebay. When mom and dad came home, the house was empty. They were very pleased with this and gave Kellie a tip of $87,015.49. But what they didn’t know was that Kellie had sold the kids to a ninja academy, where they were trained in the ancient clandestine art of ninjitsu by a mysterious ninja teacher, so that one day they would have the power to defeat their evil parents who never loved them. And one day, many years later, they finally did. Plot twist, Kellie was secretly the ninja teacher. The end.