Destination X viewers slammed a "boring" challenge on the BBC gameshow, after spotting a "fake" detail.
Rob Brydon's programme is in full swing, having been labelled a cross between The Traitors and Race Across The World.
It features 13 strangers competing to scoop £100,000as they're whisked across Europe and try to work out their location through various challenges.
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In tonight's instalment (Wednesday, 13 August), the participants were challenged with carrying wine glasses across a vineyard on a tray held by one hand, whilst answering questions about one another in an attempt to eliminate their rivals.
The more responses they got wrong, the more glasses they had to balance, resulting in several being knocked out when their trays tumbled, reports the Manchester Evening News.
Yet viewers were swift to spot that whilst the BBC episode featured sounds of glass shattering, the contestants seemed to be using plastic.
"The smashing glass sound effects for them dropping plastic champagne flutes is sending me," one penned.
Another questioned: "Why have they put a shattering glass sound on when the glasses are clearly plastic? Haha."
Others branded the challenge as "boring", as one posted: "Not liking this part... it's very boring."
Another raged: "Well this is riveting tv.. Not!"
Someone else fumed: "Sorry that wine task was total c***. I'd rather watch paint dry. switching off."
Prior to the new series launching, host Rob confessed he nearly wrecked the entire game by almost spilling a secret.
The high-stakes programme only functions if the contestants are genuinely able to participate without receiving any hints about the outside world during their journey.
Despite numerous production safeguards being implemented to guarantee this, Rob nearly sabotaged everything.

Speaking before the show's debut, the star confessed that although he was "very careful", he did encounter one close call.
He revealed: "I won't say where we were, but we were on a hillside, that's all I'll say, and we were about to visit a lovely location, and I was looking forward to where we were going next.
"I was chatting to some of the crew and I said out loud, 'I can't wait to get to [the place]' and then I realised that just over there was one of the players and I had a sinking feeling in my stomach."
He continued: "Luckily they didn't hear, and I can be sure of that because of what happened next which told me that they'd not heard. That was the only one but it was a constant fear."
Destination X continues tomorrow night at 9pm on BBC One and is available to watch on iPlayer.
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