Oh, the rules at Hogwarts are no joke! I’ve spent way too much time obsessing over the little details in the 'Harry Potter' series, and expulsion is definitely a real threat. Remember when Hagrid got kicked out in his third year because of the whole Aragog situation? Or how about when Harry and Ron crashed the flying car into the Whomping Willow? Dumbledore might have a soft spot for rule-breakers, but other staff members—cough, Snape, cough—would love nothing more than to see troublemakers expelled.
It’s not just about major offenses, either. Dark magic, endangering others, or breaking the International Statute of Secrecy could all get you booted. Even Hermione nearly got sent home after the Polyjuice Potion incident in second year. Hogwarts has a zero-tolerance policy for some things, like opening the Chamber of Secrets or unleashing a werewolf on campus. Honestly, it’s a wonder Harry made it to graduation with all the near-misses he had.