Tasha's Hideous Laughter(Player's Handbook v.3.5, p. 292)
Enchantment (Compulsion) [Mind-Affecting]
Level: Bard 1, Jester 1, Hexblade 1 (Arcane), Celebrant of Sharess 1, Sorcerer 2, Wizard 2, Sha'ir 2, Death Master 2, Spellthief 2, Initiate of Hlal (Feat) 2, Passion (DCS) 2, Passion (ECS) 2,
Components: V, S, M,
Casting Time: 1 standard action
Range: Close (25 ft. + 5 ft./2 levels)
Target: One creature; see text
Duration: 1 round/level
Saving Throw: Will negates
Spell Resistance: Yes
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, but is not considered helpless. After the spell ends, it can act normally.
A creature with an Intelligence score of 2 or lower is 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.
Material Component: Tiny tarts that are thrown at the target and a feather that is waved in the air.