Keep off the grass

A sign on a small patch of lawn outside my workplace reads “Keep off the grass. Motion-activated sprinklers in use.” Is this to keep people from walking on the grass? I think we can put this in the category of things we somehow allow machines to do, even though it would never be acceptable for people to do the same. Could you imagine a guy standing on the edge of the lawn with a hose, spraying anyone who stepped onto it? Also in this category: someone reading your personal email and then trying to sell you things based on the contents.

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