Police are investigating after a customer at a Dairy Queen drive-thru was caught on camera Tuesday throwing a drink at an employee.

Security footage shows the driver of what appears to be a red pickup truck throwing his milkshake at a Dairy Queen manager before speeding off.

The restaurant said in a Facebook post that the customer claimed the employees messed up his order."We appreciate your help in holding people accountable and keeping our workplace safe....over a milkshake he claimed was not a milkshake," it said in a Facebook post.