A man confused about a taco special flew into a rage at a Mexican restaurant and threatened to “call immigration”.

The customer became angry over the bilingual menu at Palapas Tacos in Anaheim, Southern California, when he learnt he could not get the fish taco deal on Monday.

A number of signs are written in both English and Spanish at the restaurant, and the man did not realise a banner advertising fish tacos for $1.99 which read “especial de Viernes” meant it was a Friday special.

CCTV footage captured the man shouting “We’re not in Mexico, we’re in America above the border,” at an employee and yelling at customers in line behind him.

The shop’s owner Juan Del Rio said the member of staff behind the counter was left shaken by the tirade.

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He told Fox News his staff often explain the menu to customers, but that “this guy was completely mad, upset”.

Mr Del Rio said he followed the man, who has not been identified, out of the restaurant when he left to try to speak to him.

But the business owner pulled out his mobile phone and began recording after the customer allegedly began making threats, saying he would call “immigration because you’re illegal”.