you ain't gonna believe this,

[Tom]

I've had an X-Acto blade do that, tip down.
But it wasn't wood, it was my big toe.

Ooh, been there done that, but my claim to fame is reaching into a tool box to find that I had forgotten to put the cap back on the X-acto knife. The last time I did that (last week), I stuck my thumb so far into that blade, when I pulled my had back, the blade stayed in my thumb, but came out of the X-acto. That hurt. Getting all of the blood out of that nice pristine white museum banner I was working on with the vinyl cutter was not fun either.