While the shrill female screams are more common, loud male screams are not by any means unheard of. Then a scary image (usually a Nightmare Face) pops up with either a scream or a Scare Chord, which is when you realize - after you've pried yourself off the ceiling, of course - that you've been pranked. (more often than not, you will be instructed to look very closely at the image or turn your volume up). Originating on the Internet, it pretends at first to be a game, a test, a still image, a video that is not meant to be scary, etc. A Screamer Prank (usually referred to as a 'Screamer') is a type of Jump Scare that's combined with a Surprisingly Creepy Moment or the Disguised Horror Story.
