Those Great British fans watching the men’s keirin final will probably be missing a few finger nails.
If you didn’t watch it, you missed out on an incredibly tense 20 minutes or so.
For those that don’t know, the keirin involves a derny bike that sets the pace for the first section of the race.
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It is illegal to overtake this bike until it has left the track for the sprint to officially take place.
However, it seems as though the prospect of winning gold got to the six cyclists during the race - including GB’s Jason Kenny.
It looked as though Kenny could well be disqualified after it appeared he had edged past the derny before he had left the track.
After a 10 minute wait where the judges analysed the footage, it was declared that it was too inconclusive to make a decision. A massive let-off for Kenny.
Overlapping the derny bike resulting in a restart of the race hardly ever happens. So, when it happened for a second time, it was unbelievable.
Once again, it was decided there would be no disqualifications.
It was a case of third time lucky as they six racers stayed behind the derny and Kenny beat off the other five riders to win his sixth Olympic gold. Remarkable stuff.
The gold also meant that Rio 2016 is officially Great Britain's best overseas Olympics after they surpassed the Beijing tally of 47 medals with five days of action still to go.