One of the shortest yet most powerful phrases in the English language, the use of "DO IT!" has been inadvertently sending youngmen to jail and/or the hospital since sometime in the early 1920's. If anything bad happens in your life, it's probably because one of your friends yelled this at you.
Prosecuting Attorney: And at what point did you decide that it would be a good idea to "T-bag" Officer Jones?
Defendant: When my buddies yelled "DO IT!" (Courtroom erupts in applause)