In earlier times, people occasionally saw a fiery barrel roll down the west side of the mountain of Reich-Hennersdorf towards the river Bober. This barrel was filled with gold, and vanished as soon as it touched the waters of the Bober.
— Schlesische Sagen 3 - Zauber-, Wunder- und Schatzsagen di Richard Kühnau
This is by no means the weirdest supernatural phenomenon from German #folklore ...