How being nasty can improve your life

While Gryzb recommends subtle personality changes, Kihn takes it a step further. He picked up tips from the masters – Donald Trump, Scarface and "the guy in my building with a tattoo on his face" – and decided to "blowtorch away my old personality and uncover the rock-hard warrior within". In his book, Kihn devises a "10-step programme to assholism" for anyone wanting to acquaint themselves with their darker side. He himself signed up to the National Rifle Association, started kickboxing, screamed at colleagues and ate garlic bagels on public transport.