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Not to be confused with a third blind eye.
Some psychics and other woo-meisters claim opening your third eye will give you some kind of psychic powers like ESP. Woo revolving around the pineal gland often invokes the third eye because of its analogous evolutionary morphology to the reptilian third eye.
Some say you can "feel" your third eye if you press your finger between your eyebrows and move it around until you get a "funny" feeling. In reality, you'll just make yourself look like a jackass.
There have also been a few absolute dumbasses who have resorted to trepanation of their own foreheads to expose their "third eye" or somesuch. Do not try this at home! Or anywhere, for that matter.
- IR Schwab and GR O’Connor. The lonely eye. British Journal of Ophthalmology, Vol. 89, No. 3, March 2005 pp. 256