Well, uh... that's not actually perl itself that's doing that. It's (most likely) CGI.pm, which should be included in CGI scripts for form processing (and more! :). So are you using CGI.pm, and if so, are you constructing a new CGI object? Some things to check, at least.

Also, if you *are* using CGI.pm, and you're sure about that, check that you aren't setting the $CGI::NO_DEBUG variable to 1. That will prevent CGI.pm from prompting you for keywords.