You know that rule of the Internet that if it exists, there is a porn version of it? Same goes for Valentine's Day cards. See The Walking Dead example above.
For every fan base out there, there is a Valentine's Day card to represent it. Sherlock, Harry Potter, Hunger Games, Disney movies...the list quite literally goes on and on. And since the big V-Day is right around the corner, we rounded up our favorite Internet-made love letters so you guys could pick the right one for your significant other.