[ Considering how Tadashi's a very orderly guy, his definition of "a real mess" would be one or two pieces of clothing on the floor, some books on desks and not on a shelf... So when he hears what Anna's room might be like, he just laughs. ]

Maybe you ought to clean your room sometime, if it's gotten that bad.

[ ... no, wait, here's a better idea. ]

Wait, I know. Once I build a cleaning robot, why don't you let that fix your room for you?