If Rose is laughing, it's mostly on the inside, though she can't stop a small smile at his childish reaction. She turns her head away quickly under the guise of looking at the mysterious orb.

"Good to know. I will definitely not try to eat it." She reaches out to touch the silvery surface but thinks better of it before making contact. She makes a mental note to acquire a pair of gloves; she's not keen on a repeat of the Dalek in the bunker. Instead, she uses a baton to poke the sphere.

"Haven't had a chance to ask, but how well has the sonic been working in different dimensions?" She knows that it works on her and on him, but they come from very similar realities, so it's not unexpected that the natural laws governing them both would be similar.