This image was fun to create. A little background information: The subject in the background is a Creeper, from the popular indie game, Minecraft. When playing the game, the creepers will creep up on you, and then blow up.
The idea of the picture came to me when I was messing around on the game attempting to get some creativity flowing. I started by using my webcam to take a photo of myself like I was scared or yelling. I chose to use my webcam to achieve a low/pixelated resolution image. Then, after searching the web for a decent image of the Creeper, I used the selection tool to select him from the image, and import him onto his own layer on the image of myself. I then used the quick selection tool to select part of the couch and duplicate it on its own layer. I then moved the layer of the creeper between the original layer, and the selected layer of the couch to achieve the effect of him being behind me.