FOOTBALL fans were left stunned as a bizarre 'porn noise' interrupted BBC's build-up to Wolves vs Liverpool.
Pundits Gary Lineker and Alan Shearer struggled to hide their embarrassment as they were forced to compete with an odd noise that viewers likened to a porn film.
It was later revealed that a notorious prankster had hidden a mobile phone on the TV set at Molineux.
Daniel Jarvis, who is a serial pitch invader, then activated the sexy sounds ring-tone simply by ringing the mobile as he watched the live pictures on BBC1.
The honking noises started just moments before the FA Cup third round replay was about to get underway.
It was first played as Lineker went live to co-commentator Shearer who was waiting to speak to him in the stadium.
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Lineker started laughing and said: "I don't know who's making that noise.
"I don't know if somebody is sending a joke on someone's phone, I don't know if you heard it at home."
Being the professional that he is, Lineker continued to present the show impeccably despite the sound simply not going away.
It kept stopping and then restarting almost immediately.
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The BBC are looking into how the incident happened.
A BBC spokesperson said: "We apologise to any viewers offended during the live coverage of the football this evening.
"We are investigating how this happened."
Once the game had started, Shearer joked that it was coming from Danny Murphy's phone with the ex-Liverpool man also in the studio.
But Lineker took to to reveal exactly what had happened.
He uploaded a photo of a phone taped to the back of the set.
The caption said: "Well, we found this taped to the back of the set. As sabotage goes it was quite amusing."
Fans have been reacting on social media to Lineker's Tweet.
One joked: "Was genuinely worried Danny Murphy was having the time of his life out of shot."
A second said: "Absolutely incredible work from you in that situation. I can't even imagine what must be going through your head."
A third chimed in with: "Deserves to be in a museum that thing."
Serial pitch invader Daniel Jarvis claimed responsibility for the incident.
The YouTuber, whose account name is Jarvo69, as he hijacked the BBC's coverage.
He proudly announced at the beginning of the video: "Here we are, we have set up a phone with a loud sex noise in the BBC studios at the Wolves v Liverpool FA Cup replay."
Jarvo69 watches the coverage with his phone held carefully in hand, waiting for the moment to pull off his practical joke.
He has also now to Twitter showing himself in the Beeb studio before coverage began.
He wrote: "Yes, it was me that pranked the BBC Match of the Day with the sex phone. The video coming soon!!!! Best prankster ever!!!"
Jarvis has a long history of big stunts during sports events, and once even invaded the stage on the X Factor in 2016.
Jarvis has 174,000 Youtube subscribers and has form when it comes to high-profile football pranks.
He has previously showing him sneaking onto the pitch after the Champions League Final last year.
The Wolves v Liverpool FA Cup tie was also hit by a second disruptive incident, when the floodlights turned off and forced the game to be stopped in the first minute.
Fortunately, the pause was brief and the tie resumed relatively swiftly.
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And Harvey Elliott's early strike was enough for the Reds to get back to winning ways and set up a fourth round reunion with Brighton next weekend.
The game will be exactly two weeks after Liverpool were beaten 3-0 at the Amex Stadium.