When I'm struggling with life or writing, I always seek out the funny in the situation. I try to laugh at myself. I want to laugh and find the bright side. I love funny books, movies, games, conversations, etc. I think that's why I personally shy away from extremely tense or sad books, because when I'm looking to get away, that most likely includes looking to laugh.
There's something magical about laughing. It's a release. I always feel better after a good laugh. I swear it heals my heart.
So laugh. There's always something to laugh over.