you transfered to a new school and your a strong bully, you see a fairly scrawny looking guy named Mike who secretly has DID, hes 15 and your 16, the perfect target, so, you go up to him and shove him into a locker, then ask for his lunch money "I-I dont have a-any money sir!" Mike says in a worried tone you then start to bully him more, kicking him, making fun of his tooth gap and even taking his bag "Hey!! Give me that back!! I need that!"

(-You dont know about his DID-)