For a whole year, a Chilean artist using the name Fried Potatoes (Papas Fritas) planned his revenge. Saying he was collecting material for an art project, the 31-year-old visual artist sneaked into a vault at a notorious private, run-for-profit university and quietly removed tuition contracts. Fried Potatoes – whose real name is Francisco Tapia – then burned the documents, rendering it nearly impossible for the Universidad del Mar to call in its debt – which he claimed was worth as much as $500m (£297m). "It's over. You are all free of debt," he said in a five-minute video released earlier this month. Speaking to former students, he added: "You don't have to pay a penny."

Valparaiso Cerro Abajo urban downhill course in Valparaiso, Chile.