pouët.net

http://youtu.be/ydFcH5yvtWM - smashy particles!

emkaems' link is not demo'ish.

How to make Magnetic Fluid (ferro fluid) (The fun starts at 1:17 and the real fun comes after 2:20)

Video Toaster 4000 (Amiigaaaaahhh!)

Digitalism - Pogo
Digitalism - Idealistic

Digitalism plays live in Munich on November 10th 2011.

http://youtu.be/BL5xh-wt3Vc
Possibly first gabber ever.

the music is . . . very very much not my thing. But I love the classic tunnel effect at 1:40 : )

http://www.gizmodo.com.au/2011/11/a-stop-motion-video-made-with-jelly-beans/

http://www.youtube.com/watch?v=LysVwnJsOQ8
http://www.youtube.com/watch?v=wKd7-zowkis

the last are not demoish...

This one is: Proyecto Alienoxir - IT (The Terror Clown) \o/

Bartoshe, i disagree, I think these would be acceptable in the wild demo category

http://www.youtube.com/watch?feature=player_embedded&v=4dGcRKjl0EI

Totally full of WIN!

http://youtu.be/n4T2K-dkxA4 :DD

xeron: One of the most awesome vids I've ever seen. Ever.

I don't remember if it has already been linked : Zenith watches

http://www.youtube.com/watch?feature=player_embedded&v=3YfTtGCsiD8 The world's smallest V-12 engine