Awesome injection of Superman to the movie Gravity:http://youtu.be/Gw79smKZB9E

Don't worry, no actual spoilers in the clip.

This is a cool video that produces a temporary hallucinogenic effect.  Watch it full screen, HD if possible; it's not necessary to read the letters in the center as instructed, it's just a reason to keep your eyes focused on the center of the screen while the video plays:
http://youtu.be/tVgOLWVYytM

Things you didn't know about owls:
http://youtu.be/XeFxdkaFzRA

...And armadillos:
http://youtu.be/110iUX1Ursk#aid=P5GchKsKKoA

... And octopuses:
http://youtu.be/st8-EY71K84

Best Link Evar: http://howdovaccinescauseautism.com/

In case that doesn't convince you, here's Penn and Teller: http://youtu.be/RfdZTZQvuCo

George RR Martin is a terrible Wedding Planner: http://youtu.be/KoBRto_8UII

Here's a list of awesomely useful URL's:
http://www.buzzfeed.com/jessicaprobus/33-amazingly-useful-websites-you-never-knew-existed

Number 32 could be especially fun if you're the trolling type - imagine posting a link with the comment "Check out this doofus", and whoever clicks on it gets taken to their own Facebook profile

I don't imagine this website will be relevant for long, but as long as it is, I'll be checking back; talk about suspense!
http://hasthewhaleexplodedyet.com/

Ever wonder what the moon would look like if it was a giant disco ball?  Yeah I know, dumb question; of course you have.  Problem solved:
http://youtu.be/w8I25H3bnNw

Surprise!  Taking a selfie while driving is DUMB!  http://youtu.be/xdyfvc6qJUw

Miss ANY superhero movie ever?  This video has you covered: http://youtu.be/TbdN-KigJ14

Spoiler free, in a sense, in that it doesn't actually describe any particular hero movie... just all of them.

I always thought the Canada-U.S. border was a fairly straightforward one.  I was wrong:
http://youtu.be/qMkYlIA7mgw

Will you press the button?  http://willyoupressthebutton.com

This kinda makes the terminator-esque PETMAN robot a little less intimidating: http://youtu.be/HFQYUx8BuMs

Quoted from Diddly

This kinda makes the terminator-esque PETMAN robot a little less intimidating: http://youtu.be/HFQYUx8BuMs

I prefer this one actually, as it's shorter and not just a loop.  http://youtu.be/EcOi6npIsVc