If the GIF is in fact real, (and it wouldn't be that hard for it to be real) it is likely that it isn't just an off the shelf slinky. It is probably calibrated so that the spring constant provides an upward force exactly equal and opposite of gravity.
"There remain four irreducible objections to religious faith: that it wholly misrepresents the origins of man and the cosmos, that because of this original error it manages to combine the maximum servility with the maximum of solipsism, that it is both the result and the cause of dangerous sexual repression, and that it is ultimately grounded on wish-thinking." ~Christopher Hitchens, god is not Great
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PM me your email address to join the Slack chat! I'll give you a taco(or five) if you join! --->There's an app and everything!<---