This one continues to fascinate. A Woman produced red hammer, her 10-year-old came up with a red shovel, but his mate, who was forced to take part before they walked to school yesterday, also got the red hammer. Interestingly, it certainly doesn't seem to rely on getting the sums right ('nuff said).
Said mate's family all took part later in the day after receiving email from AW, and apart from one blue hammer, all others were red, as indeed were the overwhelming majority of replies to her emails from around the country.
As a control, following the theory that most people would probably come up with a red hammer regardless of the preamble to the question, the lads were despatched to school with instructions to interview their mates, asking them purely the final question, minus the sums. No-one said hammer at all, apparently, and only one kid got the colour red. The overwhelming reply seemed to be "blue screwdriver". Boys will be boys!