In Kingdom of crystal skull, in the Amazon chasing scene, Marion was in a boat-shaped car. At the end of the chasing scene, she drives the boat-shaped car onto a tree that just happens to be growing on the side of the cliff and slips gently into the water. I guess that the tree on the cliff won't be visible from the car, because the tree was grown horizontally on the cliff.
Here is the youtube link of that scene.
I wonder, how did Marion definitely know there'll be a tree in the cliff?