Here's SOS-dan dancing in Full version (1m13s).
its the Suzumiya Haruhi no Yuutsu (also known as The Melancholy of Haruhi Suzumiya)
Ending video Hare hare yukai in full version :D
Get it here 17MB OGM X264 OGG 704x296 [1m13s]
If the video unplayable, please download :
CCCP (Windows), or VLC (Windows, Linux, MacOS)
thanks to firebird for the file.