What if The Doctor went to Hogwarts disguised as a teacher, using his tried and true alias John Smith? He could pretend that The Sonic Screwdriver was his wand. Maybe he’d suggest that they replace all of the house elves with Ood, because you know, they’re super reliable. And he’d obviously teach History of Magic, but would end up spending every lesson talking about timey-wimey stuff that none of the students understood (and secretly neither did he). 

(Source: nerdygirllove)