While having fun with each other they can purely be honest about their lives and other stuff going on in their lives to each other. Because hey, at the end of the day you are still are great friends and are supposed to be sharing things with each other.
Your real friends won’t sugarcoat the truth. They won’t lie to you just to make you feel better. They are going to tell you the harsh reality of any situation you find yourself in. Because they know you better than you know yourself.