Now there is an app to make you smile.
Holding a real-looking smile (even if its fake!) can actually improve your mood: Smile For Real helps you hold that smile and takes photo of the evidence, which you can save or share if you like.
For best results turn the sound up, and keep your face well lit!
It works, its free, and there no catch or marketing gimmick; If it cheers you up, suggest it to friends who youd like to cheer up as well.
Pro tip: Try *not* smiling at it. I bet you cant.