Now you're talking: human-like robot may one day care for dementia patients

[Valka]

Chicken/egg argument, really. 

I think the fear of something/someone not being what it seems is a learned fear. 

Where the fear of something that is in the valley is more innate.

As Yoda once said "Difficult to see".
I wonder if ants fear those spiders that mimic them and prey upon them. I wonder if wolves fear those Komondor sheep guard dogs which live among the sheep and look like sheep, until it's too late.

I know those sticks which turn into snakes are scarey. Same with clods of dirt which suddenly launch into the air and turn into toads. Logs that become gators are probably scarey, too.

Anything that can disguise itself until you get dangerously close...is probably an AMBUSH PREDATOR! 

I'll go with innate. Snakes creep me out.

Predators that are in disguise... one of the scariest SF settings I've ever encountered is Midworld, created by Alan Dean Foster. He's written two novels and a shorter story (not sure if it's a short story or novella) about it, and they give me the utter creeps. Even if I didn't have cats, those books are what turned me off of having house plants.

Midworld is a planet covered by a tropical rainforest. Everywhere. And as one of the humanoid natives there said, you not only have to be on the lookout to see a plant that wants to kill you (some of them have teeth), but you need to know when not to breathe.

[Buster's Uncle]

Robots welcome visitors to Berlin travel fair

[vonbach]

This actually reminds me of fallout 4 the entire plot is about "synths" essentially replicants.
It also hits  little close to home one my extended family has dementia.

[Unorthodox]

Robots welcome visitors to Berlin travel fair

Ok, the still looks REALLLY good...

Saw her move on the news....*shudder*

[Rusty Edge]

This has me thinking that the Terminator movies could have been so much better if they used current special effects to make the Terminators slightly less human.

[Unorthodox]

No, Terminators were supposed to be imperceptible except for apparently smell. 

Fallout 4 has it good, vonbach is right.  There's several different generations of 'synths' you run into, with progressively more lifelike appearances, till the final versions are all but imperceptible. 

(and I haven't played it all the way through but am questioning whether the main character isn't one, much like the question in Blade Runner, which was a clear inspiration, along with Terminator) 

[Valka]

The skin tone on the female robot's hands doesn't match the skin tone of the face.

[Buster's Uncle]

They did use a creepy-ass Schwarzenegger animatronic head in Terminator.  The shot of it doing eye repair in the mirror in the roach motel was definitely done that way, and you can never unsee it once you notice it's there...