In sports there's this thing called "beating yourself" when you get in your own head or make too many of your own errors and mistakes. The same can happen in video games but it's typically just a human player issue. Apparently Smash Bros. contains some form of this as a feature in their AI.
Someone set every enemy AI to 9 and began a little test. What happens if you place a level 9 AI in front of Luigi and do nothing? Don't press a button. Don't move a stick. Just do nothing.
Well, as it turns out, the AI starts to make more than just a little fool of itself.