Cackling Plague

You enter into a controlled state of madness and bellow out a maddening laughter that you share with creatures within 30 feet of you. Any creatures of your choice within range that can hear you must make a Wisdom saving throw. On a failed save, the targets' perception of reality warps as they begin to laugh uncontrollably and are incapacitated. If a creature starts its turn within 10 feet of a laughing creature, they must make a Wisdom saving throw or fall into the same fit of laughter. 

At the end of each of an affected creature's turns, and each time it takes damage, the creature can make another Wisdom saving throw. If triggered by damage, it has advantage on the saving throw. On a success, the spell ends on that creature.