how to make gnome SHUT DOWN when I say SHUT DOWN

[Britton Kerin <britton.kerin@gmail.com>]

Sometimes firefox doesn't really exit (despite all its windows being closed)
so when I say shutdown gnome pops up this dialog asking if I want to
shutdown despite a running process.  Then my laptop gets put in its bag
and tries to cook itself to death.

Is there a way to explain to gnome that when I say shutdown, I mean
SHUTDOWN NOW, REGARDLESS OF STUPID BROKEN PROCESSES?

Thanks,
Britton