Larry J said:

"Look at the back of a computer at the connectors. Virtually all of them are designed so that it isn't possible to connect things incorrectly."

Actually on my computer, the PS/2 connector for the mouse and keyboard are the same. I ***ALWAYS*** plug the mouse into the keyboard socket and keyboard into mouse socket. It goes beyond probability (should be 50/50) and is irrefutable proof of Murphy's Law. I have since grown tired of the exercise and marked with permanent ink an "M" above the mouse PS/2 socket and a "K" above the keyboard PS/2 socket.

The shear perversity of mechanical systems never ceases to amaze me. If I'm working on a car and drop a socket, it will always roll to directly underneath the center of the car (I then have to crawl underneath the car to fetch the socket). When I drop a bolt or small part where I can't see it land, the part always disappears. I have a theory about small car parts. If a car part is dropped while not being observed, a tesseract forms at the point of impact and transports the car part to a parallel universe. A person can then spend the rest of his life searching for the part but never find it. However the instant a replacement part is purchased, or the car simply reassembled without the missing part, the tesseract will immediately reform, transport the part back to this universe and place it in plain view. One could argue that this phenomena is proof that God exists and has a nasty sense of humor.

Gary