DALLAS, Texas (WPVI) -- A mystery man assaulted a 62-year-old Burger King server in Texas because his milkshake wasn't tasty enough.
Police say the man rejected three drinks made for him by Alejandra Estrada, before finally attacking her.
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Surveillance video shows the man throwing the shake and then a chair.
Police are still looking for the violent customer.
Estrada said she is afraid to return to work. She is worried the man might return.