It's a well known prompt trick to get better results. Scott Hanselman explained it like "You get to the nice corner of the internet."
[The keyword "PLEASE"] provides two reasons for the program's rejection by the compiler: if "PLEASE" does not appear often enough, the program is considered insufficiently polite, and the error message says this; if it appears too often, the program could be rejected as excessively polite. Although this feature existed in the original INTERCAL compiler, it was undocumented.