[He laughs more, so clearly pleased with himself. /laughs at his own joke like a loser. There's a small sense of relief, too, to make it feel a little less tense between them. Maybe that's why it's easy enough for him to laugh.]
Ah, my mistake. [He hums out thoughtfully, and makes a big show!1 of thinking deeply. He runs his hand down Keith's back absently as he does.] How about this one, then?
[Starts singing the opening lines to another obnoxious pop song that he knows that Keith hates, trying very hard to not just start laughing right away this time.]