either when you feel like everythingin your life is falling apart and you cant really do anything about it or when you just feel like crying and you have no clue why.
polly: "how are you?
karly: "im sad"
polly: "why?"
karly: "i dont know"
polly: "what do you mean you dont know?"
karly: "i just dont know, sometimes im just sad."
polly: "oh, i hope you feel better. let me know if there is anything i can do to help"