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]
(..) with your car. He's all right. Thank God. What were you doing in the middle of the street? Don't pay attention to him. He's in one of his moods. Quit fiddling with that thing. Come in here to dinner. STELLA: You already know Lorraine. This is Milton, this is Sally... ...that's Toby, and over there (..)1985 Back to the Future