The King, the doctors and the coffee drinker ... :)

Gustav III, King of Sweden (1771-92), believed coffee was poisonous. To prove his theory, he took two murderers, sentencing one to drink coffee every day and the other to drink tea. Two doctors were appointed to oversee the experiment and see who died first. The first to die were the doctors. In 1792, the King was assassinated at a masked ball in the Stockholm Opera House. The tea-drinker eventually died at the age of 83, and the coffee drinker survived them all.

BBC news...