Paul Wilson: Pure humour without jokes in 1970s Prague (2014) David Vaughan. The radio show deals mostly with the writing of Václav Havel. Crusaders’ School of Pure Humour Without Joke is mentioned briefly. There are some notes on The Plastic People of the Universe (rock band established in the fall of 68). “They didn’t want to have anything to do with politic, so at the time this became a strong political statement.” Says Wilson, who became a singer of the band, because they wanted to perform their répertoire in English.