A hippo sandwich is easy to make.
All you do is simply take
One slice of bread,
One slice of cake,
Some mayonnaise
One onion ring,
One hippopotamus
One piece of string,
A dash of pepper -
That ought to do it.
And now comes the problem…
Biting into it!

Sheldon Allan Silverstein

http://www.poemhunter.com/poem/recipe-for-a-hippopotamus-sandwich/