Most terrifying moment: The ending, without fail. Need to know about the following is weird, but no more. Hang the DJ Black Mirror on dating.
After a series of weird turns and fortunate events it will be the sophisticated piece of tech that is the Ashley Too doll that saves Ashley from her coma and brings the evil aunt to justice. Seeing how the characters escape is disturbing and gripping, helped by such high stakes. It's a good thing it's only TV, right?! What does the algorithm say?