When my sister visited from Sydney, I took her out to see Windchaser. She knows little about boats and being the older sister, she wanted to avoid embarressment from asking too many stupid questions. After some time on the boat, which she started to fall in love with, I asked her if she had seen the little cup sitting on the rope and wire I mount the pulleys for hauling the outboard out of the well.
She replied she had noticed it but was totally mystified as to its maritime function.
I said it was a Wilie Wagtail nest (Rhipidura leucophrys). She then admitted she believed it looked like a nest but didn't say anything as she thought with the mysteries of yachting it probably played a significant role and she didn't want to show her ignorance.
We both laughed.