[The answer is very bored, but House can sense that's a topic for another night, as well, particularly when Will continues to hold onto him. He'll also wait to ask until Will's a little more center in the present. It's easier looking back than it is explaining in the present for something like that.

There's a compromise here, one that gives them a little more time before they head out and House puts on some music for everyone so it doesn't apparently single Will out.]

Lucky you, I like singing. One song, then I'm grabbing my tablet. Pick a band. Beatles, Stones, Pink Floyd, or Queen.