Christine Ohuruogu felt like the devil was on her shoulder around the last bend, spurring her on to win 4×400 metres bronze as Great Britain's athletics team reached their Rio 2016 medal target.
Shortly after Mo Farah retained 5,000m gold to complete the double-double, the quartet of Eilidh Doyle, Anyika Onuora, Emily Diamond and Ohuruogu took to the track.
The last British athletes in action at the Olympic Stadium brought the curtain down in style, winning a first women's 4x400m medal since Barcelona 1992 by crossing the line third in three minutes 25.88 seconds.
It was the medal that saw Team GB officially surpass their London 2012 haul, with the 66th overall also a seventh for the athletics team - the target set by UK Sport for Rio 2016.
"Today it wasn't really about me," Ohuruogu said after adding to her individual 400m gold from Beijing 2008 and silver four years ago. "I just really wanted a real team effort today.
"After yesterday, we knew a medal was up for grabs but it's all well and good saying it, but we actually had to come out and deliver.
"We knew that we would need a strong performance from all the girls and they set me up in a good position. I just rolled with what they gave me. They did all the hard work, really.
"I just know that the last bend is the danger zone - that's when people start calculating what they have left for the home straight.
"I just thought: 'I am not going to wait and see who is going to charge, I am just going to go'. Honestly, I felt like the devil himself was after me - that's how scared I was."
Diamond revealed Ohuruogu gave a pep talk to the team telling them to keep composed whatever happens, with the 25-year-old producing the race of her life on the third leg.
"I'm on cloud nine," she said. "It has been a whirlwind. I'm a bit speechless and have been in tears. My mum's been in tears. It's just amazing.
"We came into this knowing we had a shot at bronze. The Americans and Jamaicans are just so far ahead, but we knew bronze was up for grabs."