Potrero Hill residents should avoid Mississippi Street between Mariposa and 18th Streets this afternoon. According to a typed note taped to a tree, a person who goes by TJFB will "materialize" there at 1:30pm today, by way of time machine. TJFB goes on to warn that you shouldn't stand "in this spot" during that time, because things could "get messy." [SFBG]
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