Quotebasically it's a lot of top end with the bottom rolled off then de-ess the shit out of it. Once you have that, reverse the vocal and print it with a straight hall reverb set to about 3 seconds and the mix set to 100% wet.
Then reverse that. You'll end up with forwards vocals rushing towards you. All you've got to do then is match it up with the original vocals and you've got classic Deep Thought.
Aha...muchos gracias Mr G