All the Allan Sherman lyrics you could want are at the Demented Music Database.

Also Tom Lehrer, Weird Al, and much more.

I was all set to sing "Don't Buy the Liverwurst" at the local folk club on the 23rd of May but Covid made other plans. My best friend and I had a tradition of singing it together on that day every year for about 50 years. He's gone now, but I carry on the tradition with my daughter.

18 stone is actually 252 pounds, not 256, but Allan Sherman is allowed a little poetic license.