I had a headache by the time the film was over, but the severed fish head floating out of the screen was cool. I still recall people in the front rows reaching out to try and touch it. ;)
http://www.youtube.com/watch?v=i92HbFBdGFc
I need to dig out my copy of Shrek 3D, (the theme park one) and see if the red and blue glasses work better on current flat screens. It was usually hit or miss with the 3D broadcasts of the '80's, and less than perfect colors on old analog tube tv sets.