Doctor Who, like the best horror films, has always been at its strongest when it performs this one weird trick. The long-running BBC sci-fi show thrives on taking a single, simple, harmless, ordinary thing you see in everyday life (stone statues, showroom dummies), then tweaking it into a creature so terrifying (the Weeping Angels, the Autons) you will never in your life see that object the same way again. SEE ALSO: 'Doctor Who' fans will be thrilled and delighted by the latest Oxford Dictionary addition This Saturday, in the new Season 10 episode called "Smile," Doctor Who is about to perform that same trick with that most simple, harmless, ordinary facet of 21st century life: emoji. If you watch it -- and you should, because it's among the best episodes of new Who -- the smiley face at the end of your texts will take on sinister new meaning. SEE ALSO: About time: 'Doctor Who' to feature first openly gay TARDIS resident If you're an old-school Whovian like me, you probably rolled your eyes at that point in the Season 10 trailer when new companion Bill Potts (Pearl Mackie) encounters a robot with a flatscreen face composed of a smiley and a thumbs-up.

As "Sherlock" Season 4 gets closer, fans are getting new looks at the PBS series. The drama released a new behind-the-scenes video that shows the cast hard at work. While it doesn't contain any spoilers, it does reveal the scheduling problems facing the show. In the video, executive producer Mark Gatiss reveals that their very tight schedule forced the cast to read the scripts aloud in the evening. "Then we had the read throughs, all back to front, but it was the only way we could do it. Evening read throughs can be very tricky because, if you do them on a day when everyone has been working, they can be very flat. But everyone had come to it fresh, so it went extremely well."