As much as many horror movies may simply be surface-level, what-you-see-is-what-you-get entertainment, there are certainly those which strive to offer up something more, rewarding those who actively engage with them and keep their eyes peeled for every painstaking detail.
And then there are films which, instead of offering up cute Easter egg in-jokes and secret pay-offs, decide to start making blatant fun of those paying perhaps a little too much attention to what they're watching.
These 10 movies all hid devilish visual gags in plain sight, yet the filmmakers also clearly took a perverse amount of joy in ribbing those obsessively keen-eyed enough to actually spot them.
While it's fair to say that most of these gags aren't outwardly spiteful - even if some of them literally spoil the movie - they do nevertheless seem to exhibit a mild disdain for those who relentlessly pore over every last frame of a film in pursuit of added "substance."
But let's be honest, for anyone observant enough to actually catch these secrets, discovery will likely only lead them further down the rabbit hole...
10. The Changing Photograph - Poltergeist
Viewers who decide to scan around the screen during Poltergeist's terrifying climax just might stumble upon a subtle troll courtesy of director Tobe Hooper.
When Diane (JoBeth Williams) is blow-drying her hair, pictures of herself and her family are plainly visible on her dresser.
But after her son Robbie (Oliver Robins) is attacked by the clown doll and we cut back to Diane being flung around her room, the picture of her daughter, Carol Anne (Heather O'Rourke), has been creepily replaced.
Some fans have claimed that the new framed picture is that of a demonic entity, though in honestly it more closely resembles Zelda Rubinstein, who plays the movie's medium character Tangina Barrons.
Either way, it's a playful-yet-creepy sleight of hand which has a little fun with audiences whose attention clearly isn't pointed where it actually should be.