You know those things that completely disgust you any time you think about them? For Articulate Joe, one of them is the part of The Simpsons episode "Trilogy of Error" when Homer gets his thumb cut off. He can't stand to watch it, talk about it, hear others talk about it, or be reminded that it exists.
Which is why it was a big deal that I got him to use a miter saw today. While I was setting it up he said, "You're doing the cutting," but eventually I got him to make two cuts. It was probably because I was holding the wood in place. As long as it's not his thumb, he's cool with whatever mishaps might come along.