This is probably one of the most annoying scenes ever, with lots of characters all shouting "Housey Housey" all over the place for no apparent reason.
Well, as it turns out, this is one of those places where I just don't get it because I'm an American. Doing a Google search this morning, I learned that "Housey-Housey" is what the British call the game of Bingo (and occasionally Lotto). And, like with Bingo, you shout the name of the game when you win.
And now you too know this piece of worthless trivia