The second live televised debate between presidential hopefuls Donald Trump and Hillary Clinton was fierier than anyone could have hoped for.
Here are seven key moments from the showdown.
1. Donald Trump apologised for his "locker room talk".
The now infamous tape recording of Trump in which he talks about grabbing women "by the p***y" in 2005 plunged his campaign into turmoil - making the debate even more eagerly anticipated.
"This was locker room talk. I'm not proud of it. I've apologised to my family. I've apologised to the American people. Certainly I'm not proud of it, but this is locker room talk," he said.
2. Hillary Clinton had her say on the tape.
The Democratic candidate said the comments about women made in the tape by Trump represent "exactly who he is".
Clinton said he had insulted women throughout the presidential campaign, saying: "What we all saw and heard on Friday was Donald talking about women, what he thinks about women, what he does to women, and he has said that the video doesn't represent who he is, but I think it's clear to anyone who heard it that it represents exactly who he is, because we've seen this through the campaign.
"We've seen him insult women, we've seen him rate women on their appearance, ranking them from one to 10, we've seen him embarrass women on TV and on Twitter."
3. Donald Trump targeted Bill Clinton.
The Republican candidate met women who have accused former US president Bill Clinton of rape and other unwanted sexual advances just over an hour before he faced Hillary Clinton.
The Trump pre-debate event was thought to be a sign that he planned to use Bill Clinton as a distraction from the controversy over his own predatory remarks about women. During the debate he said "there's never been anybody in the history of politics in this nation that's been so abusive to women" as Clinton.
4. Hillary Clinton took some inspiration from Michelle Obama.
After Trump's accusations about her husband, Hillary Clinton said a lot of what he had said was "not right".
She said what came to mind was advice from friend First Lady Michelle Obama: "When they go low, you go high." Clinton said everyone can draw their own conclusions about whether Trump respects women.
5. Donald Trump said Hillary Clinton should be in jail.
Trump said Clinton should be in jail over her use of a private email server while she was US secretary of state. He said: "I hate to say it but if I win I'm going to instruct my attorney general to get a special prosecutor to look into your situation."
In response, Clinton said: "It's just awfully good that someone with the temperament of Donald Trump is not in charge of the law in this country." And Trump replied: "Because you'd be in jail."
6. The pair had to say some nice things about each other.
The final question in the debate drew a chuckle from the two candidates as they were asked to think of something they respected about each other.
Clinton said: "I respect his children. His children are incredibly able and I think that says a lot about Donald."
Trump said: "I will say this about Hillary - she doesn't quit, she doesn't give up. I tell it like it is. She's a fighter."
7. There was no initial handshake.
When the candidates were introduced to the audience, they did not shake hands when they arrived on stage. Instead, the pair stood side by side before the debate kicked off.
But they did shake hands at the end after 90 minutes of tense exchanges.