Just like the causes of a computer virus, its effects are only limited by the hacker’s creativity. For example, after infecting the user’s computer, the Elk Cloner virus displays a poem threatening to ‘stick to you like glue’. And the Ika-Tako virus replaces all files, programs, and documents with pictures of cuddly squids.
If your mouse pointer starts jumping around the screen, don’t blame it on a mischievous poltergeist. Most likely, it’s either a drop of water on your touchpad or a computer virus.