Ben Ainslie became the most successful sailor in Olympic history as he claimed gold for the fourth consecutive Games in Weymouth.
He held flares as he celebrated after winning the men's finn class one person dinghy (heavyweight) medal race sailing competition at the London 2012 Olympic Games.
After becoming angry about the conduct of competitors at the start of the Finn class, Ainslie retaliated in front of thousands of fans on the Dorset coast.
Ainslie said they were ganging up against him and added: "They've made me angry and you don't want to make me angry. After his win, he told the BBC:
This was the time to do it, in front of a home crowd. It's just been an amazing experience this Olympics and I can tell you that listening to a crowd like that makes a difference.
He said he was unlikely to take part in Rio 2016 and said the last fortnight had been very tough for him.
The moment that Ben Ainslie became the most successful sailor in Olympic history was very special, his father has said.
Roddy Ainslie, who introduced his son to the sport when he was eight years old, said the gold medal win in the Finn class meant the world to the 34-year-old.
Speaking after Ainslie won gold in front of thousands of GB fans on the Dorset coast, he said:
I have watched him for 25 years. I have watched him in world championships, national championships, and quite honestly it doesn't really get to my heart. But today, the last one was very special. To Ben it is everything. He has worked so hard to get to where he has got.
Roddy said his son had struggled to regain fitness after suffering from back problems, but had been determined to continue.
He described the crowd's support for the sailor as "absolutely amazing", and said he would give his son a hug as soon as he saw him.