Halloween Pictures is a flash screamer made by Jeremy Winterrowd. When you click "Start here!", it shows a gallery of funny pumpkin carvings. But when you skip the halloween costume picture, a picture of a pumpkin appears along with a text saying "now for the funniest pic", but the sentence is interrupted and a gif of Sarah, from Exorcist: The Beginning, punching the screen will be played, followed by a still image of her along with a loud scream that was also used in The Maze and many other games from Winterrowd.
NOTE: The following animation contains a screamer.