Indeed, I can't find the link to the video where they show many different brands of cycle helmet splitting into pieces when heading a football (soccer) dropped from a certain height (which causes no injury for someone heading it without wearing a helmet).
(Pro-choice and anti-compulsion on the helmet issue. I choose not to wear one. I cycle 5,000 miles a year - 10,000 miles in a good year - cycle commuting in London, UK and leisure riding or touring.)
