My version of this, learned from my father, is an archbishop comes to the school and teaches a boy called William Penrose how to spell his name using syllables. Wil Liam Pen Rose and when he gets to the back of the class he comes to Archibald Arseholebrokd Arch Hi Bald Arse Hole Broke. How I was thought to say it was
First you have your Wil your W I l, then you have your Liam your L I A M, you have your Liam Will, you have your William, then you have your Pen your P E N your pen, you have your Pen Liam, you have your Liam Pen, You have your Pen Liam Wil, you have your Wil liam Pen, then you have your Rose your R O S E your Rose, so you have your Rose Pen, your Pen Rose, you have your Rose Pen Liam, your Liam Pen Rose, you have your Rose Pen Liam Wil, you have your Wil Liam Pen Rose. Then he comes to Archhibald and scorns him by saying he's too stupid to spell his name. Archibald says he heard the bishop telling William Penrose how to spell his name and that he can do likewise. The bishop challenges him under pain of the strap is he's lying to him. Archibald sets off. You have to do it the same way that William Penrose is say, forward and backward all the way. It makes it much harder to say it quickly but it is much funnier. Arch Hi Bald Arse Hole Broke.