I was rewatching Equus the other day, where the character of Alan Strang uses advertising jingles to respond to questions from his psychiatrist, notably Double Diamond Works Wonders. I was thinking that it's a brilliant concept, but wonder if Peter Shaffer understood that thise jingles would still be embedded in so many memories so long after they appeared. I still occasionally think of catching the Bass Special, or watching John Collier's window, and was wondering what other advertising jingles are stuck in people's brains?