Today, working on a new bench setup, had to joint some rough lumber. Pushed a nice bit of hard maple through the machine, and it was just harder than hell getting it to go. Looked at the resulting surface and it's terribly rough with a groove down the center - a groove, not a raised relief from nicked blades! So I look at the jointer. It's got a big gouge with a raised divot in the trailing edge of the infeed table, the cutter head looks like somebody took a monkey wrench to it, and 2 of 3 blades nicked deeply enough to be unsalvageable.

Ok, so obviously somebody jointed a board with a screw, or looking at the damage, maybe a bolt, in it on my machine. I can't recall doing so though, and nobody but me EVER goes in that shop.

Aside from the couple of hours hours it took to repair the machine, the real damage is to my self-confidence. How did I do that and not know it instantly? People trust me with some pretty big decisions at work. Not sure that's a good idea at this point.