Substitute Sam Surridge scored a late equaliser to deny former club Bournemouth an overdue Premier League win as Nottingham Forest snatched a 1-1 draw at the Vitality Stadium.
Jaidon Anthony's first-half finish looked set to end the Cherries' four-game losing streak in the top flight to ease the pressure on head coach Gary O'Neil.
But striker Surridge, who began his career with the Dorset club, poked home Brennan Johnson's cross from close range seven minutes from time after replacing debutant Chris Wood.
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The dramatic twist pushed Bournemouth into the relegation zone and leaves O'Neil still searching for his first victory since being appointed permanent Bournemouth boss in November.
Meanwhile, in-form Forest maintained their momentum by registering an 11th point from the last 18 available. Steve Cooper's side also had a first-half Ryan Yates header disallowed for offside against Willy Boly following VAR intervention.
How Forest denied Bournemouth vital win
Forest handed striker Wood a debut following his arrival from Newcastle on Friday, while Bournemouth's five changes included a first appearance for new signing Dango Ouattara.
Morgan Gibbs-White tested Cherries goalkeeper Neto during a bright start from the visitors before Yates' 13th-minute header was disallowed on review.
Bournemouth had not registered a top-flight goal or point since November 12 but grew into the game.
Unmarked striker Kieffer Moore somehow directed a close-range header over from a Jordan Zemura cross before Anthony ended their lengthy drought in the 28th minute, aided by the club's new arrival.
Burkina Faso forward Ouattara, signed from French club Lorient on Thursday for £20m, burst away from Renan Lodi on the right before crossing for Anthony to take a touch and find the far corner with a confident strike across Wayne Hennessey.
Marauding left-back Zemura was causing the away side constant problems. He had a goal-bound effort blocked on the line by Forest captain Joe Worrall before delivering another threatening centre which was nodded narrowly wide by Ryan Christie.
Forest were forced into a change in the 45th minute when 21-year-old Brazilian midfielder Danilo came on for his debut in place of the injured Yates.
Cooper's men pushed for a way back into the game in the second period but were initially struggling to create any clear chances.
Gibbs-White fired straight at Neto following a well-worked corner routine before Surridge eventually broke Bournemouth's resistance.
Johnson worked space on the right and, following another VAR review, Surridge was able to celebrate his first Premier League goal of the season to the detriment of his struggling former employers.
Cooper: We deserved at least one point
Nottingham Forest head coach Steve Cooper: "I think, in the end, it was the least we deserved.
"I won't deny we gave Bournemouth some moments in the first half, which were self-inflicted, the goal included.
"Second half, I thought we were excellent. We were by far the better team, the superior team technically, tactically."
Cooper also toasted a special moment for Surridge, who has been restricted to a peripheral role at the City Ground but came off the bench to make a crucial impact.
"Booed on and booed off, hey? I say that respectfully, I'm sure there was no malice in that," Cooper said.
"We're really fond of Sam. He's been excellent since he's come in. I can only say positive things about him. He works so hard, a really, really popular lad, a brilliant team-mate and has never let us down.
"For him to get his first Premier League goal at the club he started at and getting booed coming on the pitch is something I am really happy about - nobody deserves that moment more than him.
"I just pointed him out in the dressing room to everybody else and there was a bit of a round of applause for his first Premier League goal and that's because everybody is so fond of him."
O'Neil: There were so many positives
Bournemouth head coach Gary O'Neil: "My over-riding emotion is disappointment because the boys put a lot in.
"It's a small error for the goal. Forest are a threat on transition and we managed it so well for the whole game, they don't really hurt you with the ball, they hurt you when there's a turnover. That was annoying that one of them caught us.
"There were so many positives from the game as well but, so close to the final whistle, I'm disappointed we weren't quite able to take all three points."
Fantasy Premier League stats
Opta stats: Ouattara makes history for Bournemouth
- As well as becoming just the second player from Burkina Faso to play in the Premier League (after Bertrand Traore), Dango Ouattara became the first Bournemouth player to provide an assist on his Premier League debut.
- Bournemouth recorded 10+ shots in a Premier League match for just the sixth time this season, though they've been outshot by their opponents in 17 of their 20 league games so far this term.
- Despite coming back to earn a point, Nottingham Forest remain winless in all 14 Premier League games in which they've conceded this season, drawing five and losing nine.
- Nottingham Forest had 20 shots in this match, the most they've recorded in a single Premier League game this season.
- In his 19th Premier League appearance (18 as a substitute), Nottingham Forest's Sam Surridge scored his first-ever goal in the competition. All three of his strikes in all competitions this term have come away from home.
What's next?
Bournemouth's elimination from the FA Cup means they have next weekend off, with their next Premier League game being a trip to Brighton on February 4; kick-off 3pm.
The Cherries then host Newcastle on the following weekend, live on Sky Sports with kick-off at 5.30pm. A trip to Wolves before a clash at home to Manchester City, also live on Saturday Night Football on February 25, completes their schedule for that month.
Nottingham Forest now turn their attention to the Carabao Cup as they host Manchester United in their semi-final first leg on Wednesday night, live on Sky Sports.
Steve Cooper's side do not have a fixture in between the semi-final second leg at Old Trafford on February 1. Their next Premier League game is a home match against Leeds on February 5, live on Sky Sports.
Forest then go to Fulham, host Manchester City and travel to West Ham to complete their February fixtures.