There is a funny scene at the end of Disney's Carousel of Progress ride that shows exactly this -
a "futuristic" family is gathered for the holidays while their voice-activated oven cooks in the background. As they make various unrelated comments that contain words like "up," "heat" etc, the oven responds and continues to increase the temperature on their Christmas turkey (while the family obliviously chatters on) until it is burnt to a crisp.
I think the moment you're thinking of is when the son is playing video games, and mentions his high score. The score was some absurdly high number like 12 million, one of the other family members hears this and repeats it aloud (I believe this family member was previously controlling the microwave); the microwave hears this number and replies "heating to 12 million degrees", burning their Christmas turkey (just like they did every iteration in the ride, even as the technology progresses). I'm not sure why I bothered typing all of that, I haven't been to that ride since I was ~ 12.
There is a funny scene at the end of Disney's Carousel of Progress ride that shows exactly this - a "futuristic" family is gathered for the holidays while their voice-activated oven cooks in the background. As they make various unrelated comments that contain words like "up," "heat" etc, the oven responds and continues to increase the temperature on their Christmas turkey (while the family obliviously chatters on) until it is burnt to a crisp.