Things You'll Need
Instructions
Search for a site that hosts free scary sounds, and download a high-pitched sound like a scream.
Search for scary images online, like a distorted face or a monster. Additionally, search for a short video that contains something that will captivate your viewer's attention, such as an image with a hidden image, a movie clip or an optical illusion. Download the video and image once you find suitable ones.
Open the video editing software and create a new project. Add the video to the new project.
Insert the scary image directly following the video clip in your movie project.
Add the scary sound so it aligns with the scary face or monster image only. Turn up the volume up to maximum on the scary sound.
Save your project under an innocuous name, and send it to your friends.