I can just about remember the dialogue from the whole advert. An animation of a cowboy who has been tied to a shooting post by Mexican militia. It went:
(Mexican): "A last request, Gringo?" (Gringo): "Guess I'll just finish this here Texan bar."
He takes so long to eat it that the Mexican soldiers/shooting squad all fall asleep and as he frees himself he says, "Everybody knows...Texan takes time... to chew."