Besides the ones mentioned, I have found that eye splices can also get jammed in sheaves at the masthead. I had a set of halyards on he Catalina 27 had such long splices they kept me from raising sails completely. A former contributor to this and the pirates forum once chastised me for posting a photo of a sail that was not hoisted properly, baggy he called it.

All of those things said above, I am kind of fond of polished stainless bits and pieces on boats. Shackles and such things, especially Suncor, have been a favorite. I even have extras that I have in my tool boxes and on my work bench at the house. They look very "nautical" and are shiny.