There's a funny Stop sign near my house that says "Hammertime" under it. It always makes me smile and remember when "U Can't Touch This" by MC Hammer was a huge hit. Apparently there are quite a few Stop signs with graffiti pertaining to song lyrics.
This sign warns you there is a prison near by and not to pick up hitch hikers! It is implied these hitch hikers could have possibly escaped the prison. This sign takes low cognitive effort and was found in the virtual domain.