Ah yes, a school, a classroom and of course children busy drawing. This opening is seen in almost as many ads in adland as the classic wedding scene. But, one child only draws with the black crayon, and fills the paper with black.

There's a twist at the end of course - and it might even take you hardened adgrunts by surprise.

"How can you encourage a child? Use your imagination."

AC: Support the children's foundation