Wearing a baseball cap in hospital is the start of a chain of uncivil behaviour which leads directly to assaulting doctors and nurses. So argued Theodore Dalrymple on today's programme.
Dalrymple calls for "zero tolerance" on the matter. Baseball caps must be banned.
But is this quintessential American head-wear really worthy of such abuse? We’ve dug out pictures of five ill-advised baseball cap moments. Scroll down and decide: should they be outlawed? And do they lead to uncivil behaviour?