423. During The Battle Of Hogwarts, The Head Of Nearly Headless Nick Finally Came Off. After School

423. During the Battle of Hogwarts, the head of Nearly Headless Nick finally came off. After school restorations were completed, he joined the Headless Hunt. Thus, Gryffindor needed a new house ghost. There were many young applicants, but the title was given to a certain red headed ghost who came from many generations of Gryffindors. Twelve years later, the first of the next generation started to trickle in, and a large group of eleven year olds were excited to meet their beloved uncle, one at a time.

OK so there are a lot of things that are OK and this is definitely not one of them.