Second Division Blackpool dumped unbeaten Premiership side Birmingham City out of the Carling Cup.
Scott Taylor clinched victory for the Tangerines in the sixth minute after being sent through by Mike Sheron.
Blackpool keeper Lee Jones made two excellent saves to deny Stan Lazaridis and Clinton Morrison, who also hit the crossbar.
City were left to bemoan a missed penalty by Stephen Clemence as they suffered defeat for the first time this season.
Blackpool had quickly signalled their intention to release Taylor at the earliest possible opportunity every time they had the ball and it paid immediate dividends.
The visitors' three-man defence seemed to melt away as Mike Sheron played his pass through to Taylor, who drilled his shot under Maik Taylor's body and into the corner.
Clinton Morrison nearly replied for the visitors, rifling a shot against the bar and then forcing Lee Jones into making an excellent stop.
Stern John was then guilty of two woeful misses, the first of which climbed so high it cannoned off the roof of the stand.
Even though they trailed at the interval, Birmingham's dominance was such that an equaliser seemed certain.
But after Stan Laziridis had been sent tumbling in the box, Clemence strode up and blazed his shot high over the Blackpool crossbar.
The Blues boss responded by giving £2.5m Argentinian Luciano Figueroa his debut and the South American did embark on one mazy run forward, but it was not enough.
Their last chance fell to Morrison three minutes from time, but Jones plucked his header out of the air to hand Blackpool a famous victory.
Blackpool: Jones, Grayson, Clarke, Davis, Evans, Danns, Wellens, Southern, Douglas, Sheron, Taylor. Subs: Barnes, Coid, Murphy, Bullock, Hilton.
Birmingham: Taylor, Johnson, Cunningham, Upson, Clapham, Dunn, Cisse, Clemence, Lazaridis, John, Morrison. Subs: Bennett, Tebily, Kirovski, Figueroa, Forssell.
Referee: G Laws (Tyne & Wear).