People who tend to feel too much excited are not always doing alright. Being joyful too much without a good reason is the sign of a serious disorder. Bipolar disorder can make a maniac out of an ordinary citizen. In euphoria, such people may be dangerous for others. Another sign is when the joy lasts for too long; for instance, the birthday party passed a week ago, but the person still can’t stop laughing from the same funny event which occurred during the celebration.