What is the greatest upset in sports history?

This will probably get buried but even 21 years later it gives me such strong emotions I wanted to share it. My personal favourite other than Manchester United's late goals to win the 1999 Champions League also took place in 1999. On the 8th of May Carlisle United went into th last game of the season needing to better Scarborough's result to stay in the Football League. With 94 minutes played the score was 1-1 which was not enough - Carlisle were being relegated.

With the absolute final throw of the dice Carlisle got a corner kick, every single player ran to the box - including on-loan goalkeeper Jimmy Glass. The corner comes in and the keeper parries an effort straight to the feet of Jimmy Glass who promptly buries it - 2-1 Carlisle. Queue pitch invasion and absolute pandemonium. Carlisle stayed up.

My Dad is a Carlisle fan and I have spent countless Saturdays (and midweekers) going to Carlisle games. The energy and power that goal had. I was in tears. My Dad was in tears. I had a cassette with Derek Lacey's (RIP) live radio commentary and it still has the power to bring so many emotions back. It was one of the most incredible and pure moments watching football on my life.

Still got relegated two seasons later though.

(Here's the goal)[https://youtu.be/KejwqhLDeOs]

/r/AskReddit Thread