David Walliams had fans in hysterics as he made a playful dig at Simon Cowell and his 'plastic surgery' in tonight's first Britain's Got Talent live semi-final performance.
Judges David, Simon, Amanda Holden and Alesha Dixon made a return to the panel tonight and were impressed by The Witch's performance.
During the act, which saw Amanda and Alesha flee the panel as a real rat appeared on the judges' desk, the judges were left in hysterics when comedian David joked that Simon's worst fear was 'losing the phone number of my plastic surgeon'.
Amanda urged Simon to tell The Witch what he is scared of, before David chimed in: "Losing the phone number of my plastic surgeon."
The audience began laughing as Simon also giggled and nodded his head as he looked at David.
On Twitter, many were left in tears of laughter at David's unprovoked comment.
One person shared: " @BGT best line of the series Walliams to Cowell "forget the number of your plastic surgeon" love #TheWitches."
Another agreed: "What is Simon’s fear? Losing the number of his plastic surgeon. I’m sorry I can’t. [laughing emoji]".
Many people also revealed how much they loved the unknown act, who viewers believe could be Stephen Mulhern.
"That creepy person has such an amazing presence, WOW. I loved watching them both times, it was so engrossing, I actually forgot I was watching #BGT the atmosphere!!"
However some fans were left disappointed as the act didn't get through to the live final on Sunday.
"What a joke the witches are out I hope there is a wildcard." And @Rocky67322315 said: "I wanted the witches to get through."
Elsewhere on the show, fans were left fuming after ITV suffered from a technical blunder.
During a segment of the talent show, viewers were left disappointed as the live show cut out.
Some people made light of the situation and joked 'someone's getting fired' as the show took a quick break.
Over on Twitter, fans discussed what had happened.
One person shared: "Someone's getting fired."
Another wrote: "My tv got stuck on a clock for a few seconds…"
A third penned: "Gonna give them my 5 free votes just based on whatever that f***ing VT was meant to be."
A fourth sarcastically shared: "Wow, how do #BGT come up with such exciting ideas."
