have their origins lost in time.
Cleansing evil spirits at El Colacho baby-jumping festival
"El Colacho is a vibrant, albeit Pope-worrying festival in Castrillo de Murcia in north-west Spain, the culmination of 96 hours celebration following the feast of Corpus Christi."Though I'm really not sure at all how this could have come about...
There's no documentation, but the comments about the Church and Pope Benedict XVI are interesting.