"Go Crazy!" () is a song recorded by South Korean boy group 2PM for their fourth Korean studio album of the same name. It was released by JYP Entertainment on September 9, 2014.
A Japanese version of the song titled "Midaretemina" was released as the group's ninth (officially counted as eighth) Japanese single on September 17, 2014. The single is supported by the B-side "Fight".
During the filming of the music video in March for "Go Crazy!", a fire broke out on set, postponing the comeback initially scheduled for April to September. On September 9, 2014, 2PM released the music video for "Go Crazy!".They then released their fourth Korean studio album Go Crazy! five days later.
"Go Crazy!" Is written by 2PM member Jun. K and composed by Jun. K, Danny Majic, Glen Choi, Fingazz and Dustin Tavella. The song is composed in the key D-sharp minor at a rate of 123 beats per minute and a running time of 3 minutes and 59 seconds.
In the music video, 2PM members dance in a set with strobe lights, before crashing into a warehouse of motorcycles. They continue to dance in various sets, including a nightclub. The music video won the 2014 MAMA Award for Best Music Video.
2PM first performed "Go Crazy!" on Mnet's M Countdown on September 11, 2014. They continued to promote the song on other music TV programs such as KBS's Music Bank.