This spell afflicts the subject with uncontrollable laughter. It collapses into gales of manic laughter, falling prone. The subject can take no actions while laughing. After the spell ends, it can act normally.
Creatures with Intelligence scores of 2 or lower are not affected. A creature whose type (such as humanoid or dragon) is different from the caster’s receives a +4 bonus on its saving throw, because humor doesn’t "translate" well.