Shota Aizawa, also known as the pro hero Eraser Head, is the sleep-deprived homeroom teacher of Class 1-A in My Hero Academia, the hit anime adapted from Kohei Horikoshi's manga in 2016. Lines like this one, delivered with his trademark tired authority, became fan favourites because they capture his whole personality in seconds. Clips of Aizawa's deadpan warnings circulate widely in anime edits, TikTok memes, and Discord soundboards, where the quote is reused as a universal shorthand for a teacher's last warning.