People with severe depression often find themselves thinking about death. Thoughts about your death or the death of others, and the topic of death in general, may pop up in your mind out of nowhere. Television and movies, even comedies, can start you thinking about your brief mortality and ultimate demise.
This is not unusual, and it certainly does not mean that you’re crazy; however, you do not gain anything by lingering on these thoughts. In fact, you should use stress reduction techniques, therapy, and medication to wash them from your mind altogether.