Atlas Obscura says that this tradition was born in 1973, when the frostbitten, amputated toe of 1920's rum-runner Louie Linken was dropped into the drink of a patron. Today, all of Sourdough Saloon's toes are donations, and you'd better not mistakenly swallow one, lest you end up with a $2,000 fine and no Sourtoe membership.