"Traditionally, boys throw water over girls and spank them with pussy willow branches on Easter Monday, and girls do the same to boys on Easter Tuesday. This is accompanied by a number of other rituals, such as making verse declarations and holding door-to-door processions, in some regions involving boys dressed as bears. The origins of the celebration are uncertain, but it may date to pagan times (before 1000 AD); it is described in writing as early as the 15th century." from Wiki

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