My guess is that they got confused over the correct word to use. Hmm...funny nonetheless!
I once went to a coffee shop & ordered fried rice. As i was waiting for the uncle to fry my rice, i happened to look up at the signage for his stall and it said "612 FIRED RICE"
Er... English illiterate? Then how would an "English Illiterate" person see the ad in the first place?