"You're going to do experiments on the kitchen table? Pretty sure that's for eating."

Yet John can't exactly say he's surprised. Sherlock would do experiments on the kitchen table, and, well... That would be messy. And probably a bit of a pain, and who would clean it? Because he has a feeling Sherlock doesn't really bother beyond the very necessities.

So.

He folds his arms. "And who'd clean it up?"