I'll go first. Mine is a rewrite prompt: "Take this draft and make it sound like me, not like a robot." I paste it before almost every email, post, and message that matters. It feels like cheating because I still write the draft, but the prompt fixes the stiff parts in one pass. The other one I use constantly is a checklist prompt: "List everything wrong with this plan before I execute it." It's saved me from shipping dumb ideas more times than I can count. What's yours? A pr...