Mike Harding
"If Sigismund Unbuckle had taken a walk in 1426 and met Wat Tyler, the Peasant's Revolt would never have happened and the motor car would not have been invented until 2026, which would have meant that all the oil could have been used for lamps, thus saving the electric light bulb and the whale, and nobody would have caught Moby Dick or Billy Budd." (The Armchair Anarchist's Almanac)