"Hmm." Heiji sounded a little disapproving, actually. "I like coffee as much as the next guy, but that can't be healthy. What if he loads himself up with coffee just to get himself through them jobs of his? Maybe it's worth following him around a little more, make sure he's eatin' his vegetables."

He put a hand to his chin, looking thoughtful. "I guess I can think of one way we could do it... but I don't think it'd be all that pleasant. Kinda like travelin' in steerage, yeah? And it's a pretty long trip by plane..."

Plus, could he really ask Clara to put up with being in a confined space for so long? Seemed like a terrible thing to do to a ghost grandma.