Derren Brown did a sketch which involved the teacher of a class of five year-olds repeatedly reading aloud to those kids a short story, whilst the kids drew random scribbles on a big sheet of paper together. They ended up drawing something which looked pretty much like a teddy bear. In the lines of the story, Derren had put the letters that spell teddy bear diagonally across the page, horizontally, vertically, maybe the first letter of each sentence etc. Somehow the teacher conveyed this to the kids....