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Multiple sources who were inside Club Onyx tell TMZ the fight started when Vince went to take money out at the "cash cage." We're told Vince was complaining about a surcharge to withdraw money -- and that's when the manager got involved.

We're told the manager is from Oklahoma and flashed an upside down "hook 'em horns" hand signal and said "F**k the Longhorns" to Vince -- who, if you don't know, was a National Championship quarterback for the University of Texas Longhorns.