Weeeell... Ya say that, but:

Many years ago someone "infected" my computer with a "manual virus": A printed-out sheet of paper placed on top of the computer, telling me to delete all my hard drive's files myself, then photocopy the sheet and put both copies on nearby computers.

It was obviously a joke. But in the "modern" agentic era, the same thing in a text file is slightly more realistic as a threat...