Hail Psychic Wanderer!
All I know about pineal glands came from the 1986 movie From Beyond. Dr. Pretorious has created a machine that resonates your pineal gland. If you use it to much it the little guy busts out of your head like a worm.
Did I mention, it also makes you violently insane. Biting it off is sometimes all a damsel in distress can do.
Be very careful when playing with that,
-GH