Ah, I understand how. I was just about to comment on why Emma had OCD on her shirt, since she had that when got it when she was 5, and not born with it, but then I saw "can't change" on your post.
Well, adding a generic "Post your favorite song" here was when they did "Loser Like Me" in Regionals, and I've fell in love with the song. My friends and I are attempting to do our cover of it, with me singing both leads since I'm the only person in the city who knows English and we are trying to learn the dance numbers. Though one thing that will be hard is that we need more people, because I only have a current cast of 5 at the moment, so that really lowers the enthusiasm of the song and dims the dance numbers (notably the "swaying" in the first time they sing the chorus, and the dance number during the verse Rachel sings after Finn's solo)