This is all in good fun! Daniel Radcliffe, Emma Watson, Rupert Grint, and Tom Felton are coached into saying phrases that are supposedly common in the U.S. while doing their best American accents. I was ROFL!
Seated on one side of Mrs Obama will be J. K. Rowling, the author; on the other will be Kelly Holmes, the double Olympic vàng medallist. (The Times Online)
"David Bradley, who plays Argus Filch, the caretaker of the fictional Hogwarts School in the movies, says that Daniel Radcliffe, Emma Watson and Rupert Grint have not changed one bit since they made their debuts nearly 10 years ago..."