Most people know the minute they need some important papers, their cat will appear out of nowhere and lay on top them. If you need house a computer, the cat will sprawl across the keyboard or lay across the mouse.
Every time one cat owner tried to turn on a scanner, the cat would rush over and try to pry the lid open. Failing that, the cat would lay on top of the scanner. One time, the cat actually did pry the lid of the scanner up and wound up scanning itself in the process.