I was asked a while back what the purpose of the rubber duck is. Most don't squeak, and they don't have any specific thing to do in a bathtub, so I had literally no idea how to respond to the question.
'Rubber ducky, you are the one! You make bath time load of fun!' is all that I could think when I saw the title. On a slightly more relevant note, this is brilliant and Octamum is undoubtedly the best mum.