I don't think that crowbar trick will work on a good Kryptonite U-lock. There is a good video on http://www.youtube.com that show a guy prying open a U-lock with a hydraulic jack. The lock bent up all over the place before finally giving up. After watching that video, its fairly obvious, at least to me, that pressure with a long crowbar is not going to give you the pressure and control necessary.
-Dee Gordon Los Angeles
It's an interview with a british bike thief who
shares all the tricks of the trade. Hopefully it helps. Peace out!
http://video.google.com/
Charles Nighbor
Walnut Creek, CA