Pompey made a mockery of their slow start to the season with a 6-1 rout of Leicester in front of the Sky Sports cameras.
The visitors had won at Fratton Park just three nights earlier in the League Cup, but were blown away by a remarkable display of finishing from the Blues.
Liam Lawrence opened the scoring from the spot and added a second goal after Miguel Vitor had been sent off.
David Nugent converted from a tight angle after the break, then teed-up Dave Kitson to score, while Steve Howard reduced the Foxes' deficit.
But Kitson doubled his tally for the evening and Michael Brown wrapped up a memorable victory at the death.