It's no secret that 'Harry Potter' fans are everywhere. After all, it is one of the most famous book and movie series ever! But, did you know that some of the most rabid members of the Harry Potter fandom hang out on Tumblr? It's certainly true, and what's more, these folks are often hilarious. But, instead of you having to search through the millions of posts tagged '#harrypotter' on Tumblr, we've collected some of the highlights! Check it out!