There’s a scene in the Steve Martin film The Man With Two Brains in which his character, the unforgettably named Dr Hfuhruhurr, has to pass an increasingly absurd series of sobriety tests after being pulled over by the police. The final one is tap dancing and juggling oranges while singing the Katalina Matalina song. That’s sort of how I felt doing the bear plank with shoulder tap, except for the singing. And I wasn’t even being watched by a suspicious police officer.