Mock election in the King's Bench Prison
In July 1827, the inmates of the King's Bench Prison, a debtors' prison, in Borough, South London, devised an amusement to pass the time which gained the attention of the general public. It was proposed that they should elect a member to represent "Tenterden" (a slang name for the prison) in Parliament.
Source: Wikipedia — Mock election in the King's Bench Prison (CC BY-SA 4.0)