Speaking of female logic, I stumbled upon this:

function bbb ()
{
     vvar=4
     print -l "\nShall\nI\ncompare thee\nto a\nsummer's day?"
}

function aaa ()
{
     local vvar=1
     bbb
     echo "\nvvar is $vvar"
     vvar=2
     echo "\n=============\n"
     bbb | grep 'a'
     echo "\nvvar is $vvar"
}

%  aaa

Shall
I
compare thee
to a
summer's day?

vvar is 4

=============

Shall
compare thee
to a
summer's day?

vvar is 2

------------------------------------------------------------------

By what thinking does the piping of a function's output thru grep cancel 
the assignment to the variable?  Do we really want that?