Tell it like it is
You're s*it, and you know you are! You're s*it, and you know you are! You're s*it, and you know you are! You're s*it, and you know you are! (or crap)
One of my favourites, catchy fanchant, good ringtone. (Ed: Better audio version of this classic added)
Hello, Hello We Are the Chelsea Boys Chant
Another classic and makes a good ringtone.