This advert ran in the late 80s-early 90s in Canada, and I absolutely loved it. Yes, I'm a vegetarian, and no, I have no use for HP Sauce, nor do I believe it would "make beef sing" as the company's tagline says, but this Elvis-impersonating bull is too cute to ignore! Notice how he stops singing and returns to mooing when the last cowboy runs past... (My favourite bit is at the end: "thank you, you're beautiful"!)