4MINUTE Crazy REACTIONS

Reactions to 4Minute's "Crazy" video. Thanks to the reactors. You will find their original videos at the links below and from 3:11 on the video above. Apologies for disabling comments on this but all of the original videos welcome them.
Top Left Video: • 4MINUTE - Crazy MV Rea...
Top centre Video: • Video
Top Right Video: • Video
Bottom Right Video: • 4MINUTE 미쳐(CRAZY) MV R...
Bottom Left Video: • Video
Official Music Video: • 4MINUTE - 미쳐(Crazy)
Info from Wikipedia:
4Minute (Korean: 포미닛) is a five-member South Korean girl group formed in 2009 by Cube Entertainment with music singles and albums released primarily in South Korea and Japan. The members of the group are Nam Ji-hyun, Heo Ga-yoon, Jeon Ji-yoon, Kim Hyun-a, and Kwon So-hyun.[1] The group debuted in June 2009 with its first single, "Hot Issue", and in December 2010, it released its first Japanese album, Diamond. In 2011, the group released its first Korean full length album, 4Minutes Left.
The group received the Bonsang Award at the 20th Seoul Music Awards, and the Kpop New Artist Award at the 2010 Billboard Japan Music Awards.