Recently I was one of three adults, combined age over 200, looking after grandkids under 4 in a new house with new appliances.
None of us could change the TV volume. The remote looked pretty normal, with volume and channel buttons. With random pokings we could get it to mute, but it always came back with an anemic volume level. Turned out that rather than just press the buttons, you had to push them forward or pull them back.
Naturally this called for coffee. The coffee machine was fully automatic (in principle), grinding beans and making a dozen beverage types. We could switch it on, select a coffee type, heat it up, make it rinse itself and repeat ad nauseum. But it refused to produce anything except flashing red lights and beeps.
The fridge was more cooperative, and did not even have an internet connection. The wine inside had screw tops so no searching for a corkscrew or need to break the necks off.
Turns out the coffee machine grounds bin was full. Intuitive!