Slinky's Defy Gravity

In the 8th grade class we are learning about rebound when it comes to earthquakes.  I showed my students a video about how slinky's have a different rebound than rubber bands.  With this, I showed the students a video of slinky and how when you let go of it, it does not snap back together; instead, the top part of the slinky holds all the energy and gravity pulls it down to the bottom part before the bottom part of the slinky is effected by gravity.  The students thought that this video was fabricated, so we decided to recreate this lab to see if it truly would work.  Let me know what you think!