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]
(..) And then there'll be a site visit. Okay, um, we've just been through a very frustrating year trying to adopt a baby, so... You'll forgive us if we're not really in the mood to jump through too many hoops for a cat. Oh. Why wouldn't they give you a baby? - It's complicated. (..)2012 TvShow: Modern Family Title: Bringing Up Baby Season: 4 Episode 1