The anxiety to communicate the threatening situation to someone spills into the future (onto the future reader), and the particular medium (the wall) is available accidentally and employed in a foreign manner: the present-narrative/transcription mode of discourse is uncommon to graffiti except in statements like "I am shitting". It is like writing a note in something not meant to be ink (you could use ketchup). This (like all) accident creates verisimilitude.
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