seven surprising moments from the super bowl half-time show

Lady Gaga is leading the pitch invasion at Sunday's Super Bowl, where she'll perform the all-important half-time show. With a television audience of 110 million, it's one of the biggest platforms in the world - and Gaga has been putting in the hours to ensure her set is suitably spectacular. "We were [rehearsing] in the tent for about a week and a half, then we had to move to bigger studios in Hollywood where we are working on the rest of the show," she told Houston radio station Mix 62.5. "And then we will send that equipment to Houston where we will finish rehearsals. Fans can expect a performance that spans my career so far." How to follow Sunday's Super Bowl on the BBC Tom Brady, Lady Gaga and Tea - Super Bowl LI What to expect from Gaga's Super Bowl show She has a high standard to live up to - notably Prince's show in 2007, which took place in the middle of a Miami thunderstorm and is widely accepted as the greatest performance in the event's history, if not Prince's career. Here are some of the other most memorable - and surprising - moments from the last 30 years.