UFC 137 weigh-in: Diaz loses it, was there a method to his madness?

Nick Diaz was on his best behavior all week and then came yesterday's weigh-in for UFC 137. Diaz got in B.J. Penn's face and before Dana White could separate the fighters, the Strikeforce import threw a punch/elbow the Hawaiian's way.



If that shots hits Penn, Diaz would've been in a world of hurt and faced a big fine. Worse than that, what if Diaz hits Penn and B.J. couldn't fight tonight? Thankfully, that didn't happen.
Why did it happen? What makes Diaz tick? Yahoo! Sports' lead MMA writer Kevin Iole and former UFC fighter Frank Trigg sat down with myself on ESPN1100/98.9 FM's "The MMA Insiders" show in Las Vegas to explain the mental games played by both Diaz and Penn heading into tonight's tilt at the Mandalay Bay Events Center.

Roy Nelson and Tyson Griffin made the other news at the weigh-in. Nelson hits the scales in fat suit. He weighed-in at 252 pounds. Sources in his camp said he's closer to 245. That's good news. A focused Nelson, in better condition could be a real player in the heavyweight division.
Griffin went the wrong way missing the featherweight limit of 145 by four pounds. Griffin attempted to lose some weight, but couldn't get down to the allowable 146 pounds. The fight will be waged at 148 and Griffin will be fined 25 percent of his "show" purse.
UFC 137 weigh-in (Courtesy MMAjunkie):
MAIN CARD (Pay-per-view)
Nick Diaz (170) vs. B.J. Penn (169)
Cheick Kongo (234) vs. Matt Mitrione (255)
Mirko "Cro Cop" Filipovic (235) vs. Roy Nelson (252)
Jeff Curran (134) vs. Scott Jorgensen (135)
Hatsu Hioki (145) vs. George Roop (145)
PRELIMINARY CARD (Spike TV)
Donald Cerrone (156) vs. Dennis Siver (155)
Tyson Griffin (149) vs. Bart Palaszewski (146)
PRELIMINARY CARD (Facebook)
Eliot Marshall (204) vs. Brandon Vera (205)
Danny Downes (155) vs. Ramsey Nijem (155)
Chris Camozzi (185) vs. Francis Carmont (185)
Dustin Jacoby (185) vs. Clifford Starks (186)
Watch UFC 137 right here on Yahoo! Sports

reverse warning light bulbs reverse switch for drill press reverse unit 20824 reverse osmosis water filter systems