Quote Originally Posted by mqhanlon View Post
Rumors:
Some people have suggested that "I Know It's Going to Hurt" is about Trent and/or Nothing.
One of the supposed titles for the second Prick album was "Numb," and one of the producers listed for The Wreckard is "Numb Struggles," suggesting that that album was produced by the struggles he went through trying to work with Nothing.

The other information I've dug up is on here.
Good summary (even if those rumours are total bullshit), but this part is definitely inaccurate: "McMahon and Reznor had discussed working together in the studio around this time [pre-NIN], although it never panned out." TR is credited as a backing singer and sax player on Lucky Pierre's Communiqué EP.