Anthony Knockaert's late strike ended Huddersfield's unbeaten start to the Sky Bet Championship with a 1-0 win for Brighton.
The Frenchman struck in the 80th minute of a terrific contest with a low shot which Huddersfield goalkeeper Danny Ward may feel he should have saved.
Ward was given consoling words by opposite number David Stockdale at the end, as the Terriers saw their lead at the top of the table trimmed to a single point.
Huddersfield have been flying and knew they would head back to Yorkshire top of the table no matter how they fared at the Amex Stadium given their four-point buffer at kick-off.
An unchanged XI showed glimpses of why they have proved so tough to beat this season, as they weathered an early Brighton storm on a sultry night and looked in control at half-time.
Brighton, winless in their three previous games, could have had a flying start when Tomer Hemed sent Jamie Murphy clean through in the seventh minute, but Ward stood his ground and parried a nervy shot.
Beram Kayal flashed a shot inches wide and Hemed flicked a clever effort off target after Lewis Dunk had nodded Knockaert's deep corner back across goal.
But Town were well organised off the ball and very good in possession and came strongly into the contest as the first half wore on.
Jack Payne had a low effort well saved at the near post by Stockdale, but the home goalkeeper was less convincing when he missed a Payne cross and looked on in relief as Huddersfield failed to convert.
Rajiv van La Parra also went close against his old club with a curling shot which drifted just wide of the far post.
Brighton, eager to re-ignite their season, were back on the offensive after the break and almost went ahead in a high-powered start to the second period.
Hemed fired into the side-netting, Bruno saw his shot blocked in front of goal by defender Chris Schindler and Dunk headed inches wide of the far post from Knockaert's corner.
Huddersfield again regained control and had a decent spell in which Payne saw his low shot saved by Stockdale. But Brighton made the breakthrough in the 80th minute and it was an awful moment for Ward.
Penalty appeals were waved away as Glenn Murray went down in the box before Murphy followed up to slide a pass square to Knockaert whose miss-hit low shot was inexplicably fumbled into his own net by Ward.