Ted jumps back a little, like he's almost worried Sherlock's going to come up flinging his fists around, though he's grinning too. Ted's not a big pranker, but he's spent a significant portion of his life in locker rooms, so it's not like it's unfamiliar to him.

He shuts the song off immediately after Sherlock's woken up. "Morning, sunshine," he says, all chipper friendliness.