In case you're curious, as no one has mentioned what the erroneous output is yet, here's the output on my Windows NT4 machine:
in reply to Fun with duff's device and AUTOLOAD
Though the spaces in the output are not spaces, they are little black arrows pointing up (▲ = HTML entity code #9650)
output : Jwuv borvjgt Pgtn jbdmgt
expected: Just Another Perl Hacker
So I can see you're getting at it, but it doesn't seem to give the right results for each letter... Some seem to work (J in Just, P in Perl) but most do not.
I would like to see it work though... I'll try it on my Linux machine at home.