Clown of Madness

A creature of your choice that you can see within range perceives a massive, ghostly clown that tells horrible jokes, and is forced to scream out laughter desperately to get it to stop. The target must succeed on a Wisdom saving throw or fall prone, becoming incapacitated and unable to stand up for the duration.

At the end of each of its turns, and each time it takes damage, the target can make another Wisdom saving throw. The target has advantage on the saving throw if it's triggered by damage. On a success, the spell ends, and the clown dies.