Contagious Grin

Your mouth begins to expand twice it's regular size into an evil grin. Everyone within 5 feet of you must succeed in a Wisdom saving throw or take 3d6 psychic damage. If you fail, your mouth also starts to expand into a large grin. Everyone you see now looks as if their mouths are expanding too, but they do not feel or see this. Every round, they must make a Wisdom saving throw or take another 1d6 of psychic damage until they succeed or an hour passes.