You are rummaging though your grandpa's old stuff and see an old PDP-8 with a note attached to it. On one side there is the following key combo:



Here is a picture of the characters (written in the proper context):

On the other side you find the following text:

EXTRANEOUS DATA INCLUDED. FOR USE WITH WINDOWS NT.

What is Grandpa saying?

are all in the Unicode Private Use Area. They have character codes F0__: the first is F054, the second is F068...
Removing the "F0" at the start of each character code gives hexadecimal ASCII, which reads The rep is a Lie.