This is similar to why you see some Perl code around that has a shebang line of /usr/local/bin/perl5. During the transition from Perl4 -> Perl5, there needed to be seperate intepreters. Of course, by now everyone who is going to convert their code to Perl5 has probably already done so, but we're still stuck with some silly shebang lines. IMHO, it's better not to force the seperation if it's not needed, espcially if the underlieing runtime (Parrot) will handle both.
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: () { :|:& };:
Note: All code is untested, unless otherwise stated