Insert the disc's "Special Features" side and press your Right button button when you see the message "Trip Like I Do". An image of Manson will appear. Press your Enter button and you'll see a menu screen with three doors. Two of the doors will bring up a small animation; if you hit them four times, you'll see the clown speaking backward. The door that says "Parental Advisory" will take you to the music video.
All easter eggs were generously submitted by SirDonk