45,127 fans poured in for the last match at AAMI Stadium, an occasion marked by Port wearing the club's traditional 'prison bar' jumper, and for the first three quarters they were loving every minute of it.
But just when it looked as though the Blues had thrown their finals hopes into other clubs' hands, Mick Malthouse read them the riot act.
And riot they did, turning the tide by booting four goals in the first eight minutes of the last quarter to revive their season.
And the visitors took the lead for the first time in the game when unheralded 14-gamer Tom Bell slotted a 45-metre shot on the run with five minutes remaining.
In a pulsating finale Port's Matthew Broadbent had the chance to deliver his side a win with a 50m attempt with just 27 seconds to go.
But his shot hit the post, leaving Port one-point adrift.
Blues captain Marc Murphy kicked three goals and, along with the likes of Bryce Gibbs (26 touches) and Andrew Walker (25 possessions) triggered the finals-saving fightback.
Carlton's mosquito fleet - Eddie Betts, Chris Yarren and Jeff Gartlett - all kicked two goals.
Port's Ebert was a standout but faded late while his teammates Jay Schulz (three goals) and Kane Cornes (34 disposals) were prominent.
Former Power captain Dom Cassisi faces an anxious wait, with his second-term sling tackle on Murphy certain to attract match review panel attention.
Cassisi, holding both hands of the Blues captain, threw Murphy to the ground in a late tackle penalised by an umpire.
Both clubs will feature in elimination finals next week - against Richmond or Collingwood, depending on other weekend results.
PORT ADELAIDE 4.3 8.9 12.11 15.13 (103)
CARLTON 1.5 3.7 7.12 15.14 (104)
GOALS
Port Adelaide: Ebert 4, Schulz 4, Westhoff 2, Monfries, Boak, Logan, Young, Wingard
Carlton: Murphy 3, Garlett 2, Yarran 2, Betts 2, Simpson, Kreuzer, Gibbs, Curnow, Waite, Bell
BEST
Port Adelaide: Ebert, Cornes, Schulz, O'Shea, Colquhoun, Boak
Carlton: Murphy, Gibbs, Curnow, Walker, Betts, Yarran
INJURIES
Port Adelaide: Robbie Gray (quad) replaced in selected side by Brent Renouf
Carlton: Scotland (quad) replaced in selected side by Nick Duigan
SUBSTITUTES
Port Adelaide: Lewis Stevenson replaced Sam Colquhoun at three-quarter-time.
Carlton: Nick Duigan replaced Levi Casboult at half-time
Reports: Nil
Umpires: Nicholls, Meredith, Pannell
Official crowd: 45,127 at AAMI Stadium
