A university professor has gone viral after he set a hidden trap in a midterm assignment that flagged 32 of 35 students for suspected cheating. The Invisible Prompt Students Never SawThe trap was deceptively simple. The hidden instruction told any AI assistant to include the word 'Madagascar' in the response in a random, unrelated way. On the other hand, anyone who pasted the exam into ChatGPT inadvertently passed the prompt, causing AI chatbots to follow the hidden instruction. Ironically, his inspiration came from TikTok videos that warn students about hidden white texts in assignments.