I was re-reading portions of Dungeon World in prep for a game I’m running for Extra Life and I hit on a great idea.
There are times when character’s competence might work against them. At those times, Roll + STAT becomes Roll – STAT instead.
Two examples that come to mind:
* That Which Man Is Not Meant To Know. Comprehension of an awful truth threatens your sanity.
* I Don’t Know My Own Strength. You didn’t meant to hit ’em that hard, but you did anyway.
I think this is a nice alternative to a Defy Danger roll under the right circumstances. Though I’m sure there are games (Lovecraftian horror) where you might use it more liberally.