I already do. I’ve bashed strange designs and my initials into rocks far from civilization when I’m out hiking. With the exact thought of throwing someone for a loop long into the future. They are always subtle and small (so as not to be annoying to other users ).
So many things we do are useless. I can imagin humans a few thousand years ago saying „ lets put some stones in a line for the fun of it“
Could we pls mess with future archeologists now!