my favorite sign has to be the classic Right Turn Only lane on a road that you cant turn right on unless you drive into a field. I suppose there was a road that was fielded over(it that a word) in the past.
i got my brother this sign for when he went back to college to hang about his bed in his dorm. it also has a rectangular sign under it and has "playground" written out.
there's actually a bong recreation area. its in either south dakota, minnesota, or wisconsin. i can't remember which one it was because it was on my way to wisconsin in witch we drove through those states