#!/usr/bin/perl
use strict;
sub interlace {
### ENGAGE GOLF MODE    ###
    my@a=@_;my$z='';($z=chop($a[0]).chop($a[1]).$z)while($a[0]||$a[1])
+;$z
### DISENGAGE GOLF MODE ###
}
print interlace 'Ti sats.', 'hsi  et ';
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69 chars with strict on, according to Emacs.

Update: D'oh! Changed something and forgot to change the other part to match. Now is six characters longer.