Cars, hawks, and squirrels.
(a visual proof why there should be NO parking on campus)
A red tailed hawk (top arrow) attacks a squirrel. The squirrel (bottom arrow) hides under the garbage bin. The second image shows the hawk in midair attempting to grab his prey. A parked car, however, saved the squirrel's life (and left the hawk hungry).
By Ofer Tchernichovski