It's hard to relate to someone who has such wild/extreme 'mood swings'. [=someone whose mood changes very quickly]
She turned down the lights and lit a candle to create a more romantic 'mood'. [='atmosphere']
I'm sorry. I'm just not 'in the mood to talk'. [=I do not want to talk to anyone right now]
(..) up here? Nothin'. pounds, that one. Jaws powerful enough to crush bones to oatmeal. Willy gets into moods. You gotta give him his space. You know what I mean? Don't bother him, he won't bother you. You understand? (..)1993 Free Willy