Passwords
That is very true, best friends just know everything about each other, all the way down to passwords on phones. They need to know that information if the time arises, so they can help you out in a tough situation. It’s just to be expected of them, they don’t even need to be told.
If you ever find yourself in a jam with the police, your best friend will be there. Or if you ever need a helping hand to get rid of all those embarrassing nude photos, there they are again, just in the nick of time. It’s a bond that many people just can not understand.