Watch a top international 4x400m race and it is highly unlikely you will see a 20-metre or even 10m lead overturned in one leg. It just doesn't happen very often.
What you are about to see is not a top international race, but it does feature an international sprinter, which may explain what happens next.
Handing over for the final leg of the women's 4x400m relay at the Irish Universities Athletics Association (IUAA) Championships on Sunday, the race looked to be as good as over with University College Dublin enjoying a 30m lead.
What happens next contains more plot twists than an Agatha Christie novel.
So fast-forward to 3 minutes in, stick your headphones in, enjoy some of the most hilariously frantic commentary you have ever heard and be amazed.
University of Minnesota student Heather Dorniden was leading a four-woman race during the final heat of her 600m race at the Big Ten Indoor Track Championships.
With about 200m to go Dorniden tripped and landed hard on her face. But rather than give up and pull out of the race, she got up and gave chase with a 50m gap left to make up.
Incredibly, Dorniden made up the ground on her competitors before beating them in a photo finish on the line. Inspiring stuff.
French 4x400m team win in epic final lap
With the French women's 4x400m relay team languishing in fourth place going into the final lap, a chance at a European Championships medal looked a long shot.
Heading into the final straight, France's final leg runner Agnes Raharolahy was a full 40m back from her Germany and Great Britain counterparts. But in a miraculous sprint finish, the Flying Frenchwoman reeled in the frontrunners to claim European Championship gold in Zurich and send the French television commentators into fits of audible disbelief.
The greatest triathlon finish ever
In a race finish that is exhausting to watch, Olympic triathlon silver medalist Bevan Docherty pulled off a lung-bursting comeback to win the 2005 New Plymouth ITU World Cup triathlon.
With the finishing line looming, fellow Olympic triathlete Kris Gemmell decided to cut away from the leading pack in hope of ensuring victory.
But with a mere 25m to go, Docherty appeared as if from nowhere to overtake the tiring Gemmell on the inside and claim a dramatic win.
The women's 4x100m medley relay had been billed as one of the closest contests in Paralympic history, with Australia, Canada and Great Britain all vying for gold in the pool.
The final 10m of the race saw four countries all within a finger tip of bringing home the gold medal for their nation.
In a tantalisingly close finish, Australia pipped the Great Britain team to the win by a mere three-hundreths of a second.
