I'm studying English (and Philosophy) at university next year, and I am rarely irked by 'bad' grammar in normal life because it doesn't really matter. Ooh, he spelt 'your' wrong, let me pounce and demonstrate my superiority. Language is fluid. We don't speak without cracking the occasional infinitive.
Anyway, the lyrics that most made me laugh. I think Don't Make Fun Of Daddy's Voice is quite amusing, and "Thursday is pathetic" usually makes me smile. I love the whole message of I Have Forgiven Jesus anyway, I think it's one of his most intelligent attacks in recent years.