Wikipedia wrote:Drinking from a shoe has historically been performed as both a bringer of good fortune and as a hazing punishment. Drinking champagne from a lady's slipper became a symbol of decadence in the early 20th century.
Drinking beer out of one's own shoe is a ritual sometimes undertaken at parties and events in Australia, where it is referred to as a "shoey". Australian MotoGP rider Jack Miller celebrated his first premier class victory by drinking champagne out of his shoe, at the Dutch circuit of Assen, on 26 June 2016. Since then, Formula One driver Daniel Ricciardo, another Australian, has also performed shoeys on the podium.