Labour MP Alex Cunningham caused raucous laughter during Prime Minister's Questions in the House of Commons today, by asking David Cameron:
"On food safety, can the PM confirm that traces of stalking horse have been found in the Conservative Party food chain?"
Mr Cameron admitted the "ingenious" question had "thrown him completely."
Ed Miliband repeatedly pressed David Cameron in Prime Minister's Questions on whether he would recommend that Britain should leave the EU in a future referendum.
Labour leader Ed Miliband has said his party does not want an in/out referendum on Europe.
The Labour leader Ed Miliband is asking the Prime Minister to give guarantees that he will recommend that Britain should leave the European Union if he does not get the settlement he wants.
David Cameron responded saying: "I want Britain to be part of a reformed and successful European Union."
Labour MP Ann Clwyd, who revealed that her husband of 50 years "died like a battery hen" in hospital, asked David Cameron in PMQs what he planned to do about the "increasing complaints about nurses who fail to show care and compassion to their patients."
Ms Clwyd told the BBC's World at One programme he was treated with "coldness, indifference and contempt" by nurses.
The Labour leader Ed Miliband accused David Cameron's cabinet of being "at each other like rats in a sack".
Mr Cameron countered that Mr Miliband worked in a Government in which the Prime Minister couldn't be in the same room as the Chancellor.
The former Defence Secretary Liam Fox asked the Prime Minister whether he would address the issue of access to justice as well as press regulation.
He said he that anyone should have the ability to use the existing libel and defamation laws and not just the rich.
The Prime Minister said people "should be able to rely on a good regulatory system" to stop abuses happening before they reach court.
The Prime Minister and Ed Miliband are arguing about the figures relating to the Government's work experience scheme.
Mr Miliband claimed that unemployed people stand a better chance of getting a job if they are not on the scheme.
David Cameron has said that the status quo in the media industry is "unacceptable and needs to change".
Speaking during Prime Minister's Questions, he said he hopes the house can work "across party lines" on the issue.
The Labour leader Ed Miliband agreed that it was an all-party issue.