Whether of not you have issues with paper, you probably have both paper clips and staplers in your house/office. Many people are in the habit of paper clipping sheets together because it is quick, easy, they wan’t the sheets together and may want to unclip them in the future.
Watch out for those paper clips adopting other documents. Use staples whenever possible over paper clips as the latter will often “clip” up another document that is not meant to be clipped to it. Most recycling opportunities will now take the staples with the documents.