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.
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.