Posh ended their relegation worries with an impressive 4-1 victory against Blackpool at Bloomfield Road.
There were calls for the head of home manager Steve McMahon after his side capitulated in their last home game of the season.
Backed by more than 1,000 visiting supporters Peterborough took the lead on 18 minutes when Blackpool keeper Phil Barnes was adjudged to have fouled Calum Willock while playing to claim the ball.
Curtis Woodhouse stood up and relieved some of the tension by converting the spot kick.
Less than ten minutes later the lead was doubled when Blackpool failed to deal with a hopeful cross from Clive Platt and the ball fell to Woodhouse who fired home from the edge of the area.
There was a glimmer of hope for the home side two minutes later when Martin Bullock scored his first goal of the season beating a defender before curling a lovely effort into the corner.
Peterborough took their two-goal advantage back seven minutes after the break when the Seasiders' defence failed to deal with a straight forward through ball from Adam Newton and the lively Willock lost his marker and finished neatly from close range.
The best goal of the game came six minutes later when David Farrell hit a 25-yard drive which caught Barnes out to send the visiting supporters into ecstasy.
Posh boss Barry Fry said: "It was a tremendous performance from the supporters as well as the players.
"A lot of supporters came up to Blackpool and got behind the lads. Everybody contributed.
"We had three players who had injury doubts about them but they did themselves justice." Blackpool boss McMahon added: "I can't take any positives from that and have searched long and hard.
"It was frustrating. When you analyse every player, there were ten players who started who by their own admission under-performed."