Photo credit: Will Yakowicz via Patch [http://parkslope.patch.com/articles/neighborhood-oddist-shackles-skeleton-to-park-slope-tree#photo-10645041] A “gruesome skeleton” nailed to a tree in the city-owned empty lot on 12th St. near 4th Ave is making neighbors uncomfortable [http://parkslope.patch.com/articles/neighborhood-oddist-shackles-skeleton-to-park-slope-tree#photo-10645041] , which seems like a relatively reasonable response to