What could I have been thinking? It’s a question we ask ourselves with regularity when we have acted like dunderheads, making some half-baked decision on a purchase or a course of action, a relationship, a career move or a business deal. It can apply when we have done something we shouldn’t have or not done something we should have. And it can always apply—probably more easily, given how we’d rather point the finger outward than at ourselves—to others. What were they thinking? (Bush/Cheney invading Iraq, Clinton with Monica, every person who consents to being grilled on 60 Minutes, all karaoke…