Fans of BGT: The Champions were left dismayed as host Ant McPartlin accidentally caused mayhem at homes across the country on tonight's show.
He set off Amazon's voice-activated virtual assistant Alexa with his introduction of the winner of the 2017 German version of the series.
Asked by co-presenter Dec Donnelly how they should introduce 12-year-old Alexa Lauenburger and her eight dancing dogs, Ant said: "I'll show you. Like this.
"Alexa, show me Germany's most amazing dog act."
Viewers flooded social media with reports of how the seemingly innocent line had set off their devices.
One tweeted: "BGT, please stop saying 'Alexa', mine is going crazy."
How many people’s Alexa’s did @BGT just cause to go off? Mine just answered back.
Another posted: "How many people’s Alexa’s did @BGT just cause to go off? Mine just answered back."A third wrote: "My Alexa started having a malfunction when Ant said 'Alexa'."
— Jack Mawhinney (@jackm91) September 7, 2019
— Tom Gardiner (@IAmTomGardiner) September 7, 2019
— Entire Ant and Dec (@EntireAnD) September 7, 2019
— Michaela wain (@Michaelawain1) September 7, 2019
— 🌟💫CLΔIRΣ ΣDШΔRDS💫🌟 (@claire3979) September 7, 2019
That set off my Alexa 😂😂 #BGTChampions
— RealBenMC🚂 (@benmc919) September 7, 2019
— Britain's Got Talent (@BGT) September 7, 2019
— Dean Irwin (@DeanIrwin81) September 7, 2019
— REBECCA (@becca_jacobs) September 7, 2019
Despite the chaos, fans praised Ant & Dec, who had tonight's golden buzzer, for giving it to the youngster, who stunned the audience and judges with a circus-themed performance that included an amazing dog conga.
Simon Cowell told Alexa: "This is the best dog act I have ever, ever seen.
"You, at your age, to have that relationship with those gorgeous dogs is amazing."
Fellow panellist David Walliams said: "This isn’t just one of the best dogs acts we've had on Britain’s Got Talent, it's one of the best acts we've ever had
"This is pure, unadulterated joy. I could just watch that for ever."
Alesha Dixon said: "My eyes were literally popping out of my head.
"You've shown us something we've never seen before. It was outstanding."
Amanda Holden added: "I couldn't stop smiling throughout the whole thing."
Alexa's golden buzzer means she goes straight through to the series final.
* BGT: The Champions continues next Saturday night on ITV.
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