Closest I have come was with two knives. Both were loaned out.

First was a cheap folder with a tanto blade. Room mate picked it up from BESIDE my screwdriver and went to use it to unscrew a hinge. The tip broke. I reground it the best I could and put a bit of a penetrator tip on it.

The second is an old sheath knife, VERY fine edged. Was a real razor... Another buddy tried chopping with it and took a BIG chip out of the edge. Still have it and plan on trying to regrind it, but I'll need to take a good 3/8" off of the blade. <img src="/ubbthreads/images/graemlins/frown.gif" alt="" />