There is this piece of hacker lore, where a person discovered that he could not log in into a machine when standing. As soon as he sat, the login worked. After

There is this piece of hacker lore, where a person discovered that he could not log in into a machine when standing. As soon as he sat, the login worked. After checking whether he is not standing on the keyboard cable etc., he discovered that the keyboard had two keycaps swapped. When he was standing, he needed to look at the keyboard and wrote the password incorrectly. When sitting, the muscle memory was working, ignoring the wrong keycaps.