Boy ! Am I Stupid (Green and Purple)

Remember the old windows 98 desktop ?  Well, one day  (2001) I decided that my desktop and its peripherals were way too close to my open windows. I disconnected everything and re-connected my computer in middle of the room sitting  the peripherals on various tables I had then turn it on.

The computer kept poping up this dialogue box saying "Computer unable to find a mouse" so I check all the connections and again I turn on my computer and again the dialogue box pops up saying "Computer unable to find a mouse"

What was the problem? Well, the keyboard was in the mouse jack and the mouse was in the keyboard jack. (they're both the same size jacks)

I then notice something the two jacks they have different colors:  green and purple. I also notice the plug of my keyboard is purple so I guess that means it goes into the purple jack, and the green plug of the mouse goes into the green jack  and it work.

Note: the mouse back then had a ball inside of it which had to be clean from time to time. They now have mice with lasers which I like a lot better.

Below  is a short video of my commodore 64 computer but unlike windows, Commodore didn't use any color codes. However the cords that went into the various peripherals were all different sizes. So if  a cord  didn't fit into any perticular jack then it didn't belong there.