The Bavarian village of Oberammergau has a special deal with God. While the bubonic plague was ravaging Europe, the town’s citizens vowed that if they were spared they would perform a play every 10 years depicting the life and death of Jesus.
God, apparently, accepted. The death rate among adults rose from 1 in October 1632 to 20 in March 1633, but then it dropped again to 1 in July 1633.
True to their word, the villagers staged a play in 1634, and they’ve done so every 10 years ever since.