It took me quite a while to get it to rhyme AND stay in metre... now that it is, it must stay forever.
Also, Parent teacher evening last night, Bio teacher said
"Do you ever see TV chefs peeling carrots? They had to peel carrots for someone else before that, even though they could cook. You can make a wonderful cake, but you loose marks that carrot peelers would get"
I'm a big fan of the extended metaphor, so this made me smile