I saw a plushie “octopus” at one of the craft fairs we were at recently, and asked my wife to crochet one in the most neon snot green yarn she can find. My plan is to attach a hair clip to it and have a brain slug for when we do any costume parties. If it doesn’t use up the whole skein I’ll ask her for a smaller one to push the gag a little further and offer it as a token of friendship from the brain slug planet.
It’s mostly that I’m not always comfortable in costumes or large gatherings, and this would give me the latitude to still dress comfortably and also not seem like a downer if I’m not into the vibe of the party.