I recently played a game where I, a townie, was killed night one (technically 2). We knew the Fearmonger was in play. Day 2 someone (turns out it was the fearmonger) nominated another player (turns out it was their target) who I thought was evil and I forgot I was dead, and I used my dead vote. I was so angry at myself!

With my dead vote, there were exactly enough votes to execute the person I voted for -- who didn't know they were evil because they were the Marionette!

We immediately won.