whats a little ______ among friends

Whats a little ______ among friends in which the blank may be any variety of words, is a way to say it is no big deal that this thing is happening between them because they are close friends, and friends can deal with anything that comes their way. For instance, if someone says whats a little fight among friends they might have been having a disagreement but its not a big deal because at the end of the day, they are still good friends.