10) We like (nearly) all of the same people. We met because of Glee and that'll always be something we share, but even once Glee is over, we will have plenty of common interests. In fandom and out of fandom.
9) We hate all of the same people. This is often even more important than #10 tbh
8) I've met so many amazing people because of her. Becca is the kind of person who befriends everyone, whether on Tumblr or random people in the grocery store. Chances are if I followed you in the last year or so, I probably did it on Becca's recommendation. I've made some of my closest friends that way.
7) Her taste in movies and TV shows is flawless and she's very insistent on wanting everyone else to love the things she loves. On her first (or was it second?) visit here, she found out that I'd never seen The Princess Bride, How to Train Your Dragon, or Tangled and we had to make an immediate trip to Redbox so she could enlighten me. She was totally right too.
6) I've had laryngitis for seven months and from a costs-benefits standpoint, there are very few people who are worth the pain and aggravation of trying to talk on the phone with currently. But I talk to her on the phone every chance I get and I always feel better afterwards. I'm starting to think she's developed super sonic hearing as a result because she rarely has to ask me to repeat myself.
5) I can talk to her about the hard stuff I don't tell anyone else.
4) She's even more of a cuddle whore than me which is excellent when we are together. And we have a massive collection of cuddle reaction gifs for when we are apart.
3) She never annoys me. Assuming you've been around people for any length of time, you probably know that as a species we're inherently annoying so that's pretty damn impressive.
1) Even when we're both having a rough day or being cranky or insecure or whatever, I never ever doubt that she cares about me. I care about her and she cares about me no matter what and if that's not the definition of best friends, I don't know what is.
So HAPPY BIRTHDAY, BECCA! *throws rainbow glitter*