I didn't say that he did it for fun, but I do remember him saying that he pushed down to that weight because he could rather than because it was necessary. Not sure if that would be a case of the producers misrepresenting what they had said to him or what.
Honestly, I thought it was overdone. I had a hard time even watching The Machinist because I felt like his bones were going to shred his skin and/or cause him to explode in a spray of human shrapnel at any moment. I realize this was part of the character, to an extent, but yeah, bit excessive.
That (Bale in Batman Begins) didn't look like 180 lbs on a 6' frame to me. Then again, it doesn't look like 220, either. I guess I shouldn't have said "pretty sure".
P.S. 3:10 to Yuma rocked. Saw it a few days ago.