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Monkey Beats the Gong (3.5e Feat)
From D&D Wiki
Monkey Beats the Gong [Martial Style]
Allows you to make an attack of opportunity if at least two of your Flurry of Blows strikes hit.
Prerequisite: Flurry of Blows, Dex 13+
Benefit: If at least two of your attacks in a Flurry of Blows attack hit one target you succeed in knocking them off-balance. This allows you to immediately launch an unarmed attack of opportunity against the same target. You must have an attack of opportunity available to you to be able to utilize this feat. Enemies immune to critical hits are immune to this feat.
Special: Monks may use their special weapons to make this attack.