Lewis Guy scored an extra-time winner as MK Dons defeated Premier League Blackpool 4-3 in round two of the Carling Cup.
Jermaine Easter also scored twice to add to Blackpool's misery after their 6-0 Barclays Premier League defeat at Arsenal on Saturday.
The home side led in the first minute through Sam Baldock's 18-yard strike before Brett Ormerod brought the visitors level after the break with a header from Neal Eardley's cross.
Easter then netted twice in as many minutes, the striker rounding Mark Halstead for his first before doubling his tally after a neat one-two with Baldock. But Ludovic Sylvestre's free-kick to the far post went straight in to get Blackpool back into the tie.
Ormerod also had two close-range efforts disallowed for offside before a late penalty from substitute Charlie Adam - following a melee in the box - took the game into extra-time.
Substitute Guy, on for Dietmar Hamann, then netted with just over 10 minutes of extra-time remaining after Easter was involved in the build-up.