UCLA was down by one point with only seconds left on the clock. However, they were lining up for an easy 28-yard field goal attempt. They had already scored three other field goals during the game, including to 50-yarders. This was going to be a piece of cake. The whistle blows, they kick the ball, one of our players lunges into the air...blocked! The field goal spins away and misses the posts! Time expires! BYU with the win!
(Although that's about as close as you can get to a loss and still manage to pull it off...)