Some more riddles:

 % perl -mstrict -le 'print $x**$y;'
1
 % perl -l
require strict;
print $x**$y;
<EOF>
1
 % perl
#!perl -MCarp -Mstrict
Too late for "-MCarp" option
 %
[download]

Perl's support for -M on the #! line is limited (to the point of not being supported at all in my version of Perl, v5.6.0). Your version appears to support it to some extent (was that small amount of support added or was it removed because it was buggy and too much work to do right?). That is why we have use.

-mstrict does nothing useful, just like 'require strict;'.

Oh, and nice trick. Thanks. (:

                - tye

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