First-half goals from Republic of Ireland forward Sammie Szmodics and Liam Delap fired Ipswich to a first Premier League victory in 22 years as they stunned Tottenham with a superb 2-1 away win.
The promoted Tractor Boys had been denied a maiden league success this season by a stoppage-time leveller against Leicester last weekend, but finally got off the mark at the 11th attempt.
Szmodics' acrobatic effort put Ipswich ahead in the 31st minute and Delap made it 2-0 12 minutes later to set Kieran McKenna's side halfway towards a long-awaited result.
Rodrigo Bentancur reduced the deficit for Spurs with 69 minutes played, but they could not muster a grand finale and missed out on the chance to rise to third in the table.
Tottenham had won their previous six home matches, but were up against a manager that spent 16 years at the club as player and coach in McKenna.
Ex-Spurs academy coach McKenna almost had a goal to celebrate on the second minute of his return as Szmodics bundled his way into the penalty area and had a low shot saved by Guglielmo Vicario.
It sparked an end-to-end start as Brennan Johnson poked wide Son Heung-min's cross soon after before Town defender Cameron Burgess headed against the crossbar from a Leif Davis corner.
The hosts responded with a Dominic Solanke shot deflected over and the England international forced Arijanet Muric into a decent save with a low 19th-minute effort after Cristian Romero's ball over the top.
Ange Postecoglou's team had appeared to be getting to grips with Ipswich's aggressive press by the midway point of the first half as Muric made another stop to prevent an own goal from Davis after he deflected Johnson's cross goalwards.
However, the visitors had already looked a threat out wide and made the breakthrough just after the half-hour mark through Szmodics, who is in the Ireland squad for the coming week's Nations League fixtures against Finland and England.
Jens Cajuste's cross was headed up in the air by Romero under pressure from Delap and Szmodics was first to the loose ball with a fine overhead kick which beat Vicario from close range.
Johnson had been slow to react and one goal for the visitors quickly become two after more excellent wing play.
As a Spurs move broke down with a poor Son pass, Omari Hutchinson carried the ball impressively and possession was worked out to Szmodics, whose cross was parried by Vicario into Radu Dragusin and it allowed Delap to lash home on the goal-line.
Boos greeted half-time, but Tottenham returned with renewed vigour and after the break with Son having a shot tipped over and Solanke bundling home from a corner only for VAR to cut short home celebrations as the England forward had handled the ball before it went in the net.
Spurs remained in the ascendancy but were restricted to hopeful efforts as Solanke drilled over from long range before Son curled off target.
Postecoglou sent on Timo Werner with 24 minutes left and Tottenham did pull one back three minutes later through a set-piece.
Pedro Porro produced an inch-perfect corner to the near post, where Bentancur powered home a header for his first goal of the season.
Spurs peppered the Ipswich goal with another Son effort sent off target before Werner forced Muric to tip over his 25-yard strike.
Werner lifted another shot over before Postecoglou turned to James Maddison, but the Tractors Boys would not be denied and held on for a memorable win.
Newcastle hit three second-half goals to come from behind and beat Nottingham Forest at the City Ground.
Forest were on the way to consolidating third position in the Premier League as they led at half-time through Murillo's early header.
But Alexander Isak, Joelinton and Harvey Barnes struck after the break to earn a deserved 3-1 victory and keep Newcastle handily placed in eighth in a hugely condensed league table, which sees seven teams separated by one point.
For Forest, a three-game winning run came to an end with just their second loss of the season and they were left to rue a poor second-half performance as boss Nuno Espirito Santo suffered the customary manager of the month curse after winning October's gong.
The day started well for the hosts as they went ahead in the 21st minute through Murillo.
The central defender, who will head away on international duty with Brazil after receiving his first call-up, got in front of his marker from Anthony Elanga's free-kick to glance past a helpless Nick Pope.
Newcastle's response was good and they pushed for an immediate leveller, with Bruno Guimaraes forcing Matz Sels into a stretching save.
The Belgium goalkeeper was again called into action to keep out Dan Burn's bundled effort at the far post.
Forest were on the back foot as half-time approached and Newcastle thought they should have had a penalty when Elanga went through the back of Joe Willock.
Newcastle started the second half on top again and Guimaraes came close with an audacious effort with the outside of his boot which went just over.
The visitors' dominance did leave them susceptible to Forest's counter attack and Nicolas Dominguez could have made it two as he raced clear from Chris Wood's pass but Pope saved with his feet.
And moments later, in the 54th minute, Newcastle were finally level.
Anthony Gordon's corner fell kindly to Isak who pounced to convert from close range.
The game opened up and, as Forest countered again, Burn was lucky not to earn a second yellow card when he chopped down Jota Silva.
Isak blazed a volley just wide before Newcastle did go ahead in the 72nd minute from a counter attack of their own.
Isak fed Joelinton and the Brazilian was given too much space to curl into the far corner from the edge of the area.
They killed the game in the 83rd minute with another goal from back to front as Barnes converted at the near post.
Eddie Howe's men saw the game out with ease to move up to eighth, just a point behind Forest in third.
