This would be especially useful very early in the year as part of your introduction to the nature of science. Have copies of the Demo Report papers ready for everyone, and have your 3-hole bottle ready to go. If any of your students have had physical science or physics, they might already have a deeper understanding than the others, and perhaps should be asked to give others a chance to think about the underlying mechanism and respond before they offer their own ideas. I want you to show or write down on your Demo Report paper, in ink, and without any conversation, what you think will happen when I do this. Write their predictions quietly on their Demo Report.
Teacher asks for a sampling of some of the predictions, without judgment or question.
Have the basin ready to catch some water. Teacher steps down from demo table, and asks for a sampling of these possible explanations. Record these on the board or overhead. Don't judge these yet. Sharing these just gives everyone the realization that there can be a variety of explanations.