I've seen a lot of compliations and fanmade musicvideoes and other fanvideoes in my life, but I must say that this is one of the better ones. Fun music, clips that actually fit, some mixing that shows that the creator has some video editing skills.
But it's difficult to screw up something from Big Bang Theory :)
Now I'm off to see the episode where Penny makes Sheldon keep a secret from Leonard, and Sheldon ends up high on valium. Enjoy the video!