<human>: Can you provide a brief overview of the text?

Last night my friend left his keys in my dorm room. I decided to drive his car to the other side of the city and hide hints in various places in the city to lead him to it. This morning he walked in my room asking where his car was and just handed him his keys and his first hint. He told me he was going to "get me back for this" and then left in search of his car. So I just found out a few minutes ago that he is planning on coming in my room later tonight with some cookies, with laxative in them, that he says is from our R.A.'s mom and that they were delicious and I had to try one. How can I turn this prank around and make it backfire on him?
<bot>: Friend trying to get me back for a prank I pulled on him by trying to feed me laxative cookies. how can I make this backfire on him?