FlowingData shared this video, and I just had to pass it on:
I think it is a wonderful metaphor for explaining a statistical concept that is often baffling to students. I already plan to use it in my Research Methods course this spring, and I think it will be great to have in my pocket for other courses, like intro, where confusion on these types of things often arises.
or the Dow Jones Industrial Average, are quite variable in the short term but point to underlying trends in the long term. Public opinion polls would be another example.
Overall, I think this works really well, and I'm grateful to FlowingData for getting it out there.