Former Brazil goalkeeper Dida enjoyed a lot of success in his playing career. He won European and Italian titles during his time with AC Milan but fans remember him for one incident. Milan played Celtic in 2007 when he produced one of the most embarrassing moments ever. A Celtic supporter ran onto the field and lightly slapped Dida as he passed by.
Nobody condoned the fans’ action but it wasn’t exactly a knockout punch. Dida hit the floor as if someone smashed him with a sledgehammer and required a stretcher to leave the field. It was ridiculous because it didn’t hurt him at all. Later, UEFA hit him with a two-game ban for his antics (via Daily Star).