I have recently had an encounter with the opened baggage compartment door of a PA28 whilst stepping down from the wing. I was wearing an open anorak, which was blown behind the baggage door by a gust of wind right as I shifted my weight to put my left foot on the step below. The result being the lower right side of my nose hitting the upper edge of the (then) bloody baggage door with quite some force.
Always tell everybody to wait opening that baggage door until everyone has come out of the airplane...