Peter said: "I see it as a perfect opportunity for all of us to derail Brexit.
"Hopefully unite behind the Lib Dems and stop this self-harm from happening.
"Every other member of the public has the opportunity to change their mind."
The LBC slapped down the caller for saying people should derail Brexit
Having none of it, Ferrari thundered the British people had democratically voted to leave Brussels.
The LBC host said: "There's something called democracy and the referendum has taken place. That's it, it's over. We are Brexiting, it's just what sort of a Brexit it is.
"We are we are. We're not where you want to be. Get over it.”
To which Peter responded: "We made a mistake."
There's something called democracy and the referendum has taken place
It resulted in the LBC host roaring: "In your view, we made a mistake, in the view of many other people, we made the right decision. That's what democracy is."
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And after locking horns about the relevance of debating something that happened almost a year ago, Peter stole the last word as he said: "Nick, we asked the opinion of butchers on the procedure of brain surgeons."
It comes as Theresa May on Wednesday will seek the approval of the House of Commons to have a snap General Election on June 8.
The PM announced on Tuesday she had decided to call the vote, despite previously saying she would not because the other parties could not come together over Brexit negotiations.
Politicians react to Theresa May's snap general election Wed, April 19, 2017
UK Prime Minister Theresa May has announced her intention to hold an early general election on June 8
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Theresa May has called for a snap general election
She said: “The country is coming together but Westminster is not. In recent weeks Labour has threatened to vote against the final agreement we reach with the EU, the Liberal Democrats have said they want to grind the business of government to a standstill.
“The SNP say they will vote against the legislation that formally repeals Britain’s membership of the EU and unelected members of the House of Lords have vowed to fight us every step of the way.
“Our opponents believe because the Government’s majority is so small that our resolve will weaken and that they can force us to change course. They are wrong.”
Following PMQs, MPs will debate the General Election call and will then vote, with Mrs May needing a two-thirds Commons majority to go ahead with the election.