No matter how long the slinky is, the bottom of the slinky will stay still (hover) until the top reaches it. Even if the slinky is over 1000 feet long.
http://www.physorg.com/news/2011-12-secrets-levitating-slinky-viral-web.html
totally legit too
(via brightlightslonggnights)
still blows my mind!