Go to any bonfire in a quiet place. The Chamber of the Princess is a good spot. Listen carefully to the sound made by the fire. Turn up the volume or use recording software. It is a women's voice. She is quickly repeating:
"Don't even think with your head at all."
If you really concentrate, then the discordant noise surrounding the bonfire transforms into a constant hypnotic beat of the Tibetan bowl/bell resounding again and again to program the phrase into you. It is in perfect sync with the phrase!
There are also more subliminal messages throughout the game. In Duke's Archives, there are a mix of female/male/Japanese/American voices. These begin once you turn off the alarm at the archives. They will also appear at times for the rest of the game. The voices are barely audible, so use some recording software to pull out the noise. I can catch some of the words:
When you say: hands off of things or Jesus Christ or kick your ass...
trust the essence of things...
that's when you say that they took ...
kill yourself all day.. (this one is by a female Japanese voice and is the most obvious)
even when your doing the slightest move or advance
I wish I could make out every word spoken, but some spots are heavily garbled.
Anyway, I just find it all amusing, mainly because even with this added hidden layer of difficulty, a portion of us still managed to beat the game despite all the odds against us!