What is goldfish eating of the 1920's?

Goldfish Eating was when a group of people would gather together and, as plain as the name, eat goldfish. People would compete against each other to see how many they could swallow whole. This really became popular when in 1939 when a Harvard college student swallowed a goldfish when the other couldn't. It grew from there.

Eventually, it became so popular, laws were made banning the 'cruel consumption' of the fish.

here's some more information: http://www.badfads.com/events/goldfish-swallowing/