What is This?

       During one of my lectures, the instructor had included the following at the bottom of her slide

keep in mind that my view of this was about a forth this size

        It appeared to me that the person on the right was drinking a soda and the one on the left was looking through a telescope.   I thought the instructor had said something about cell phones and looked at the image again.  Yes, I suppose they could be cell phones.  It wasn't until I had adjusted the picture that I saw the line between the two props

        Oh, it's two cans and string communication!  That is what I can see here.  But I can still see a telescope and a soda bottle.