The amiright.com site bills itself as ‘making fun of music, one song at a time’, and judging by the content they are certainly on the right track (arf arf). The two key parts of the site are a song parody section (which really should be called lyric parody) and the excellent ‘misheard lyrics’ area.
I bet you thought it was ‘So why I love to come home?’ in the Beatles’ A Hard Day’s Night, didn’t you? Hah!