The planform of a small Cessna (in fact most small GA planes) is basically shaped like an airfoil. It's just a function of fitting "fat" cabin and engine space into the most streamlined shape possible.
It will produce Bernoulli/Venturi suction to pop open unlatched doors and windows - up to the point that the suction pull balances with the slipstream/propwash "push" - a few inches or cms.