I would never do it because the devil.. Satan is our worst ENEMY. But if a person is stup... Enough to do it... You blaspheme the Holy Spirit and then ask satan to be your god. Nothing but bad could come from it. Please do NOT do it !!
If you do it will act like a fun harmless friend. Then you will start noticing that its not so harmless, it becomes pushy. Then it bullies scares, torments your everyday life, wont let you sleep, have friends, enjoy the things you love etc. Please take it from someone who knows them well, do not move to that realm! If you need help I can give you the knowledge to get rid of them. Good Luck