[This is Keith, barrelling straight into the thing yet again, yup, completely unaware of what he does to Shiro as he takes by surprise -- singing stuff with his eyes closed so he doesn't psyche himself out. Maybe he's not a pro but just singing has always been dumb easy, he likes it even. It's just having an audience that's new.
But it's just Shiro after all, so in the end... well, he can't call it that weird all things considered. He wants to.]