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]
(..) When you've killed for us in the past... we've always been satisfied. That's exactly why today is going to be very hard for me. I hope you'll excuse my mood. My man was killed right here on your turf. The Chinks tell me that the hit man... was kind of the Italian type. (..)1994 Léon: The Professional