Ant and Dec unfamiliar faces to Jeremy Corbyn in TV quiz
Jeremy Corbyn failed to recognise two of the UK's most popular TV presenters - Ant and Dec - in a general knowledge quiz.
The Labour leader also stumbled over how many Olympic gold medals cyclist Sir Bradley Wiggins has won, despite tweeting his congratulations to the athlete just days ago.
Mr Corbyn and his rival, Owen Smith, were tested on their pop culture knowledge during a live debate on BBC One.
The embattled leader failed to identify Britain's Got Talent hosts and Labour supporters Anthony McPartlin and Declan Donnelly when he was shown a photo of the duo.
Despite being told they were Geordie TV presenters, he told presenter Victoria Derbyshire: "I cannot name them, I'm really sorry."
After being told who they were, he added: "I hope they'll be happy about this. They sent a letter of support.
"I will apologise humbly for my mistake. I do apologise, it's all right."
Mr Smith, however, was quick to name pop stars Taylor Swift and Justin Bieber when shown an image of the pair at an awards ceremony.
Both struggled to correctly answer questions about sport, with Pontypridd MP Mr Smith over-estimating the total number of medals won by cyclist Jason Kenny, who notched up his sixth Olympic gold medal on Tuesday night, and also falling flat over Wales's winning scores during the Euro 2016 football tournament.
Mr Corbyn stumbled over how many gold medals Sir Bradley has won, after also getting it wrong in a tweet last week when he said it was eight instead of seven.
And while Mr Smith knew the price of a litre of unleaded petrol, Mr Corbyn was 14p short when he said a first-class stamp costs 50p.