Clark began singing the song, which was a hit for the show's judge Gary Barlow in 1995, before he revealed that he was joking.

© Ken McKay/Thames/Rex Features

© PA Images / Ian West/PA Wire
Clark exclaimed: "I'm not really singing that. That was just for you, Gary!", to which Barlow responded by laughing.
After his performance, Barlow said that if "this was a competition for how many songs you could kill in two minutes, you'd win", before adding: "When you started off, the best bit was my song."
Clark, whose performance also included a cover of Psy's 'Gangnam Style', responded to Barlow's comments by saying that he had "booked a cab" for the judge, in case he felt like leaving - referencing the moment Barlow stormed off stage last week after his act Carolynne Poole was sent home from the competition.
Meanwhile, fellow judge Louis Walsh said that Clark's performance was "entertaining with a capital E", and asked the whole of Essex to vote for the 25-year-old contestant. Tulisa added that it was "blinking entertaining".










