What modern object would look most suspicious to someone from 300 years ago

[Highland Builder]

Not the obvious things like phones or televisions because those would clearly look magical immediately

I mean objects that would create deep confusion because they look ordinary but behave strangely once used

For some reason I think wireless earbuds would seem incredibly suspicious because there is something unsettling about tiny invisible voices entering people's heads while they walk around pretending nothing unusual is happening

Also robot vacuum cleaners would absolutely be mistaken for cursed furniture

[NovaPrime68]

Electric toothbrushes would probably look medically dangerous to people from the past

[RayOfLight31]

Air fryers already sound fake even now so explaining them historically would be difficult

[Skibidi98]

Someone from 1720 seeing people speak to smart speakers would assume the house itself was haunted

[IronFist66]

Motion sensor taps would convince people they had offended a water spirit

[Dylan38]

I think escalators would deeply disturb people because stairs should not move under any circumstances

[BretHart99]

Robot vacuum cleaners definitely move with the energy of a minor household demon

[Andy89]

Automatic hand dryers already sound like machines preparing for takeoff