Fumbletongue

Enchantment (Compulsion) [mind-affecting]
Level: Bard * 1, Warlock * 1
Components: V, S
Casting Time: 1 Standard Action
Range: close (25 ft. + 5 ft./2 levels)
Target: one creature
Duration: 1d4 rounds
Saving Throw: Will negates
Spell Resistance: yes
  This enchantment causes a creature to be unable to speak intelligibly. Any effort the target makes to talk, in any language, comes out as a useless mix of unconnected words and noises. Even magic words are affected to some extent; the target has a 20% spell failure chance for any spell it attempts to cast with verbal components, and a 20% chance to incorrectly use a command word to activate a magic item.
  This spell has no effect on telepathic communication, or the vocalizations of creatures that lack a spoken language.