In order not to spend it all in lollipops and toffees

You gave it to the P. M. G. to keep it in his office.

Or in this way:—

You bought a three-gear bicycle because you had a will for it,

And now you've gone and fetched the thing and cannot pay the bill for it.

Rupert, you're in the cart."

"By Jove, Uncle Harry," he said in an awestruck tone, "that's poetry."

"Is it?" I said. "I just threw it off."

"Oh, yes, it's poetry all right. It's got rhymes, you know."

"Rupert," I said, "let us come back to plain prose and consider your desperate financial situation. You cannot get your three pounds ten."