This guy is totally brilliant!
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Haha I love the Seth McFarlane stuff.
I know you added ‘no music videos’ but I’m gonna post this anyway.
Huun-Huur-Tu performing Borbanngadyr:
http://www.youtube.com/v/h2DxJMuftBI
And Zappa 
http://www.youtube.com/v/8e3I0iagWXU
Oh man ;;;that star trek thing is hilarious …REally 
And there are lots of them
Someone has way too much time on their hands in this one. Absolutely great stuff:
http://www.youtube.com/v/g069AFLtL40
My own video I created is awesome of course:
http://www.youtube.com/v/LTW09McfCjA
Hilarious radio pranks from Radio 1 Scott Mills. Funniest vid yet I think:
http://www.youtube.com/v/St56_zW263c
This video mocks the “free energy” world. It’s quite a laugh if you’ve ever seen one of those ‘perpetual motion’ vids that always grind to a halt despite the best efforts of the creator. ‘Steorn’ is basically a company which claim to have ‘found’ free energy, but most suspect them to be deluded/fake.
http://www.youtube.com/v/5Q_ESdiF2wM
The best bit of IT crowd:
http://www.youtube.com/v/o-QjskHTSf4
<----Wicked, favourited.
http://www.youtube.com/v/UVA7MDQr1Nc[/embed]
http://www.youtube.com/watch?v=5hllwWjyIEw - in case you don`t seen this yet
I knew a kid like this…Disturbing stuff…
http://www.youtube.com/watch?v=qYxke5trIVA
http://www.youtube.com/v/n77auNQDiPk[/embed]
errrrrrr… 
fuckkkinnngg evill
Great, isn’t it? I really laughed until I was high when I first saw those. They occassionally - disturblingly - venture into Alf territory too:
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holy cow!
This kid is totally fucked up!
I love this one
http://www.youtube.com/watch?v=Q5im0Ssyyus
Oh yeah! How could I forget that one. I’ll probably die watching that some time
TWO MORE FAVES
OCTOCAT and
http://www.youtube.com/v/VYFuThdOyDg[/embed]
ADAM BUXTON
http://www.youtube.com/v/hAX6yi60OPY[/embed]
It’s not Youtube, but worth a watch, Hubble Telescope’s best shot:
best video clips i’ve ever seen =)
ahahhahaha, these both vids are real gems!! 
^^heh - quality 
*edit
And it just gets better!
/ /
oh my that’s just crazy!
another cool music video: http://www.youtube.com/watch?v=vs1CA5hFdd4