My grandfather didn’t understand how my laptop works. He asked me to teach him. I explained how the folders and files work, and how to move the mouse on the screen. I asked him to open a file. It was a photo. "How to do that?", He asked. I told him to click on the file name twice. “But I don’t have two mice, how can I click twice?” He asked.

My grandfather didn’t understand that he can click twice with the same mouse.