Here are some examples:
* A cell wall: While important for plant cells, it's not a membrane-bound structure within the cell, but rather a rigid outer layer.
* A virus: Viruses are not cells, and therefore don't have organelles.
* A protein: Proteins are individual molecules, not complex structures within cells.
* A molecule of water: Water is a simple compound, not an organelle.
* A rock: Rocks are inanimate objects, not biological structures.
In essence, anything that is not a specialized, membrane-bound structure within a cell that performs a specific function is a non-example of an organelle.
