I try to divert my mind from th topic which is givin me bad mood. I'l watch some comedy, or go for a run or listen to some music or some inspirational things or just try to quiet my mind by focussin on just one thing like th sound of fan or focussin on breathin etc.
When I'm in a bad mood, I used to play loud music and sing along with it. And sometimes, I used not too talk just to refresh my mood.