" the company was just a vehicle for Elizabeth and Sunny’s romance and that none of the work they did really mattered. Ian nodded. “It’s a folie à deux,” he said. Tony didn’t know any French, so he left to go look up the expression in the dictionary. The definition he found struck him as apt: “The presence of the same or similar delusional ideas in two persons closely associated with one another. "
― John Carreyrou , Bad Blood: Secrets and Lies in a Silicon Valley Startup