Meditation is the best for me. Not striving to get out of the "down" state, but just being there, present, watching it, feeling it, being with it. You know that sooner or later it'll go. Just as being cheerful also goes. Arts are also wonderful. For me it's music. For some people painting or writing. Those are ways in which you can connect with your feelings and discover some really neat things when you can really connect. You channel your complex emotions into creativity. I personally think that playing a videogame or having a distraction can some very specific times get you out of a mood, but most of the time it will just be avoidance of something that is happening within you. We are so used in avoiding ourselves. Be it a videogame, TV, a reel, a joint, a beer, a chat, whatever. For me there are few things better than what happens when you manage to overcome the boredom, fear, anxiety or whatever keeps you away from being just where you are and decide to just stay there and look at it with eyes wide open. Something opens. It's probably not fireworks nor spiritual epiphany, but a subtle thing that has the taste of real. And that real is oh so liberating.