I know what you're thinking...what's an accidental cup?
What I was trying to 'design' was a sampler scarf to use in lessons for beginner knitters - the quotes are because I'm not sure just how much designing most people would feel a scarf requires. Anyway, I knitted up a scale model in this icky spare yarn I bought about thirty years ago, looked at my paper cup of hot tea and - bingo! - in my mind it became a cup holder. Accidentally.