What’s hers is yours, she’s not in but you desperately want to borrow that sparkly new nail polish? No problem! Her door is always open to you.
You know that any problem can be solved through the purchase of food for the other, as you both have intimate knowledge of the snacks of choice. Happiness is but a tub of Cookie Dough Ben and Jerry’s away.
Your arguments last 30 seconds, at most.
You both find your personal jokes a little bit too funny, making everyone else feel a little bit weird. It just gets worse the more you try to explain.
The thought of them getting a significant other keeps you awake at night, what would you with your time?
You will never let each other forget your worst moments, and frequently bring them up in the most unflattering circumstances. Who says any occasion is too formal for a good-old vomiting story?
All of your funny anecdotes contain each other.
People who don’t know you well get you mixed up, even if you don’t look similar.
Losing them on a night out seems like a disaster, and you both spend the rest of your nights attempting to recover, each other.
You have complete conversations in sarcasm, and any witnesses would think you hated each other…