I expect Parrot will do a great job of running Perl 6, but a relatively poor job of running other languages. Of course, I'd be happy if I were wrong (except for the brief moment of receiving a pie in the face at OSCON 2004), but I don't expect that to happen.
-- Guido van Rossum, in http://linuxfr.org/2003/03/12/11491.html