I was in a rock covers band and one of the songs we did was over the hills and far away by Gary Moore. During the lead intro to that song I couldn't see a thing because the stage lights were blinding. The intro is solidly in E and I played merrily away at seriously loud volume which meant I couldn't truly hear what I was playing. Whilst I was pulling all the rock faces and gesticulating as I bent and sustained notes, turns out I hadn't noticed I was playing at the 11th position, d# , instead of e. We always recorded our shows and as all sat around the TV, as over the hills started it sounded like a cat having its nuts removed as I wailed away in the wrong key. Took quite a while for that howler to be forgotten about I can tell you. Let's enjoy your stories that are bum note, mishaps and howler related.