Duck and cover, it's a drive-by fruiting! Guerilla Grafters stick fruit-bearing limbs onto San Francisco's ornamental trees, making city streets into food-producing mini-orchards. (Grafting has been standard practice with fruit trees since basically forever, so there's nothing Frankenfoody about this.) It's not technically legal — the city discourages planting fruit trees, because of worries that fruit will attract vermin. So Guerilla Grafters makes sure that each grafted tree has a steward who looks after it.

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