Slovak high school students left the hall during Prime Minister Robert Fitz’s speech against aid to Ukraine. When he said “go fight if you’re such heroes” they responded by jingling their keys and exiting

What is the significance of ringing keys?

One of the elements of the Velvet Revolution demonstrations was the ringing of keys. The gesture had a double meaning: it symbolized the opening of the door and was the demonstrators’ way of saying to the Communists, “Goodbye, time to go home.” – https://en.wikipedia.org/wiki/Velvet_Revolution#Jingled_keys