Oh ohohoho. This is good. Okay so first of all I would trap them within my infinite inner world. Then, I would force them to attack me. Literally. And when they see their strongest attacks do NOTHING against me I would create a star and asked them if they wanted to continue "fighting" against me.
I've thought of another one for if people like really piss me off. First off trap that person within my inner world. And then chuck them into a void where they can't feel ANYTHING not even time passing and also keeps them alive, never letting the person die of hunger nor thirst nor anything else. Then when I feel like it I would teleport them to the outside world and parade them around like a fancy new pet.