Shaun of the Dead/Nightmare Fuel

• Near the end of the film, David is dragged through a window by zombies kicking and screaming, and is gruesomely disemboweled, torn limb from limb, and eaten alive. Ouch.
• Early in the movie, Ed and Shaun are driving down a road, and you briefly see a family trying to get away from their zombie mother, who drags the son back inside the house. If that isn't scary enough, look closely (or freeze-frame your DVD) and it shows the son is carrying something: a toddler.
• The lights being switched on in the basement of the Winchester. If it hadn't been for Shaun pulling the shade down comically and the jukebox gag afterwards It would have been worse.
• Philip's sudden zombification.
• The moment when the undead groom shuffles silently into the house. Shaun and Ed are engrossed in the television which is showing a News Report on the unfolding events; in the background, the front door is slowly pushed open and a dark indistinct something stumbles forward just out of shot. The news report then reminds everyone to keep all windows locked and barricaded. As Shaun and Ed slowly look at each other with horrifying sense of realization, a shadow crosses the living room wall behind them...
• The revealing of Pete's zombification. At the beginning of the film, as Shaun is getting ready to go to work, he snaps shut the mirrored cabined on the bathroom wall to reveal the reflection of an irritated-looking Pete moaning about the door being left open overnight. The next day, as Shaun is steeling himself in the bathroom, he snaps the cabinet shut again -- but instead of a perfectly-alive-if-not-somewhat-pissed-off Pete reflected behind him, there's the dark, silent shadow of a man standing perfectly still on the other side of the shower curtain.
• Some of the unnamed zombies wandering around outside the Winchester are utterly terrifying if looked at closely. A special mention goes out to the identical twin zombies; identical twins can sometimes be unsettling in their own right, but the blood-stained, blank-eyed bodies of two fairly large and completely indistinguishable men lurching around just sends shivers down your spine. Furthermore, when the group pass them in their bid to reach the Winchester, a garbled scare chord plays, which only exacerbates things.
• Really, no mention of Shaun's mum? [[spoiler:The bit where you see her arm with a gaping hole in it? Shaun having to rush away from zombies invading their safehouse to watch his mum die, convulsing as she does? The offscreen shotgun-cocking sound just afterwards, with one of his "friends" pointing a shotgun (rightly, but tactlessly) at her? Being handed a gun and told to shoot your own mother? The effect when her face changes just before he does?