Nature of Language (Linguistics 101) Class, Carnegie Mellon.
The professor is attempting to show the difference between British English and American English, specifically that the British drop their Rs in certain places:

Professor: Could everyone try to be British and say this word: “Beers”.
Class: Be-as! Be-as!
Loud Girl in Back: IT’S PRONOUNCED “STOUT”!

— Overheard by Connor