Laugh when you feel like it. Life is full of suffering and pain. Joy is not to be undervalued, interrupted, or judged.
The joy that we have as individuals is something that no one should ever interrupt, or judge us by, and is something that we should never take for granted. Some see joy as an emotion, but having joy is actually an attitude, or a way of life in which we all should try to keep on a daily basis. Even though there will be times in our lives that we are unhappy we should still never let anything take our joy from us.