My first dungeon crawl in 1998, I rolled dice wrong for 6 years
Turns out I was adding my character's strength bonus to every attack roll instead of just melee weapons, and a friend at a convention in Chicago pointed it out after watching me play for 20 minutes, so has anyone else gone years with a misunderstood rule that made the game way easier?
Oh man the strength bonus thing hits home. I spent like 4 years thinking my rogue got sneak attack dice on EVERY attack, not just when I had advantage or a buddy flanking. Made the game way too easy and my DM never said a word til another player called it out.