I once used a password which our IT department gave me and it was !'a;@,oq and at least for me it looked random enough. I had it as a root password on a server and I enabled password login for about 2 minutes because I wanted to resize some virtual hard drive or something and couldn't be logged in as a normal user and then switching with su to root because then the normal user would have open files on the file system…
columns, not rows.
edit: damn, too late I can't change it anymore.