Suddenly a large plastic garbage bag is thrown into it. It floats amidst the murk, hits the surface, and bumps clumsily into the base of a tree. Silence; until the plastic bag lunges and clings to the tree's branch.
A large plastic garbage bag is thrown into it, causing a sudden commotion. The bag floats, hits the surface, and bumps against the base of a tree. Silence ensues until the bag clings to the tree's branch.