Radio presenter tricks his co-host into thinking he's swearing on air

'Stop it! I do want my job!' Radio co-host's priceless reaction as presenter pranks her by pretending they're live on air and swearing profusely Viking FM breakfast presenter, Alex Duffy pranked Emma Louise Jones Pretending they're live, he begins talking about 'acceptable' expletives Each time he says a swear word Jones' is visibly stressed and shocked Her horror augments until Duffy reveals it's all a joke 'I hate you' she says, vowing to get him back one day Pranking your co-host by swearing live on air (or so she believes) is a mean trick to play. But Viking FM breakfast presenter, Alex Duffy didn't hold back from his expletive-filled joke as he taunted Emma Louise Jones. Duffy convinces Jones they are live on air at their Peterborough studio - he even switches the red 'on air' light - as they 'begin' their show just like every other day. 'Nowadays we're starting to think differently about which words are acceptable and which words are not acceptable,' he says in professional radio mode. He reveals the top 10 offensive words have been released, immediately worrying Jones. 'If you're going to make me guess them, remember we do want our jobs,' she points out. 'You're making me nervous,' she adds before Duffy launches with the swear words. He starts with 'bloody' which doesn't worry the blonde too much. She admits: 'You can express yourself better if there's a bloody in there,' although falters slightly on 'bloody'. But word number nine - beeped out, somewhat ironically, by Viking for their Facebook page - provokes shock and horror from Jones. 'Alex!' she cries, 'It's not even 8 o'clock!' 'I'm scared,' she says as Duffy perseveres. Each time he swears her reaction is priceless, she jumps slightly in her seat, her mouth wide open, he hands occasionally clamping over her mouth in horror. She begs him to stop although admirably manages the situation well despite her extreme discomfort, apologising to 'listeners'. 'You're getting too much satisfaction out of reeling these words off,' she accuses. Duffy even leaps up with outraged intake of breath as the presenter continues, 'Alex! You can't!' she yelps, evidently intensely stressed and shocked by her co-host's audacity. The blonde removes her headphones as she desperately pleads with the prankster. 'What are you doing? Can somebody help?' she begs, looking around for anything or anyone to get her out of the awful situation. Word number one nearly sends her hysterical as she jumps up, mouth open, hands on her head, almost speechless. Duffy chuckles at Jones as she sits hyperventilation before calmly revealing, 'Emma, it's alright, we're not on the radio.' 'Oh my God, I hate you!' she cries, 'I literally want to call you every word on that list... I'm genuinely shaking.' 'I'm going to have to get you back,' she vows as the video ends. 'I genuinely thought I was going to LOSE MY JOB!' Jones wrote on Facebook when she later shared Duffy's post of the prank