to troll someone you have to me secretive and know when the right time to strike is.in order to do that you have to know when the victim you are gonna troll leaves to hunt or something.so to do that you have to stalk him in order to find out when he leaves his house.once you have done that you can go troll him.one way of trolling him would to put lava above there door and make a redstone path going to a lever inside the house then put a sign saying PRESS FOR DIAMONDS. when they press it the lava should fall on top of him and kill him.there is other ways but i think you should figure them out if you have trouble leave a comment saying you need help and ill make another blog.