I used to have a friend that sometimes would wear a 1/4″ phono plug around his neck. I thought it was cool, but I’m sure everyone else thought it was geeky beyond belief.
Now you can get your nerd on with these funky little keychains from Pocket Plux. The keychains have either a phono plug, xlr or DIN cable, but I hear that they’ll make a custom version for you with any connector that you’d like. See them here.