Citibank just got a $500 million lesson in the importance of UI design - Ars Technica Published on February 22, 2021 https://arstechnica.com/tech-policy/2021/02/citibank-just-got-a-500-million-lesson-in-the-importance-of-ui-design/ Citibank was trying to make $7.8M in interest payments. It sent $900M instead.