Eleven from 'Stranger Things' met Neville Longbottom from 'Harry Potter' and our hearts can't handle

You may need to sit down for this one because your fandom brains may explode!

SEE ALSO: The Duffer Brothers are reading your 'Stranger Things' Reddit theories

"Stranger Things" became the must-see TV show over the summer, and if you haven't watched it by now you are sorely missing out! With the uber success of the Netflix hit came a cult like fan base, much like popular franchises, such as "Harry Potter."

Fans of "Stranger Things" are hard core, developing their own theories about the Upside Down, figuring out if Barb will ever make an appearance again (?!), and what lies ahead for season two. Much like the fans of "Stranger Things," "Harry Potter" fans are just involved, if not more. So, what would happen if everyone's favorite character from "Stranger Things" met up with one of the most beloved characters of "Harry Potter"? FANDEMONIUM!

Yes, that's right...Eleven met Neville Longbottom!

Matthew Lewis who played Neville in the "Harry Potter" franchise posted this picture on Sunday with the caption "A lot of people ask what my tattoo means. Now you know.@milliebobby_brown #XI #Eleven."

While this is taking us a few second to process, will someone please start writing some "Stranger Things"/"Harry Potter" fan fiction, ASAP?

Check out more "Harry Potter" fun in the gallery below.

Shop for Harry Potter products
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Shop for Harry Potter products
Pick up a complete 8-film set collection for the "Harry Potter" series. It's available in Blue-Ray and DVD and it's a big bargain at just $60! 
For kids (or adults!) who haven't gotten their hands on the full collection of "Harry Potter" books, it's the perfect gift to pick up. Paperback just $45 and a hardcover collectible collection is $120! 
The new book "Harry Potter and the Cursed Child" from J.K. Rowling definitely rekindled the fan flame and it's worth reading! Snag a copy like this one, which includes Part 1 and Part 2. 
Super fans can appreciate this gift -- a Marauder's Map mug! When it's cold, it just looks like a normal black mug and then when you put a hot beverage inside, it turns into the map.
What better way to get into the Harry Potter spirit than to take a trip to Hogwarts? The magical world at Universal Studios is fun for the whole family and you can check it out in Hollywood or Orlando. (Photo by Gabriel Olsen/FilmMagic)
If you're going to be a wizard you've gotta have a wand. This little baby does magic and illuminates when you cast a spell. 
The LEGO set for Harry Potter comes complete with a Hedwig and a couple witches on a broomstick. 

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