The very worst celebrity career catastrophes, from Roseanne's racist tweet and angry apology to Kendall Jenner's tone-deaf Pepsi advert that saw her ridiculed across the world. Plus, Angus Deaton and Frank Bough's various trysts with sex workers, and cheating courtesy of former cyclist Lance Armstrong. With contributions by Len Goodman, James and Ola Jordan, Vanessa Feltz, Louis Walsh, Sinitta and Bobby Norris