Gaming can be seriously affecting at that age...I wonder about what occasionally. I suppose finding out about the concept of death through gaming can be a gentle way to introduce the subject, though Mortal Kombat is anything but gentle ?Super Mario Bros 3 for me. I couldn't have been any older than 2 or 3, it's the oldest memory I still somewhat remember. I play Street Fighter 2 and Mortal Kombat 2 really young too. Getting knocked into the Dead Pool by the CPU was my first exposure to death as a concept and it messed baby me up a bit at the time.
Altered Beast had a similar role for me...quite surreal unsettling imagery in that one. I need to practice my death cry delivery