/etc/default/virtualbox - If you're bored shitless of virtualbox preventing your computer from shutting down cleanly; and concequently needing to check your disks on every boot - this is the file for you to edit

default

# Defaults for virtualbox initscript
# sourced by /etc/init.d/virtualbox
# installed at /etc/default/virtualbox by the maintainer scripts

#
# This is a POSIX shell fragment
#

# Set this to 1 if you would like the virtualbox modules to be loaded by
# the init script.
LOAD_VBOXDRV_MODULE=1

# SHUTDOWN_USERS="foo bar"  
#   check for running VMs of user 'foo' and user 'bar'
#   'all' checks for all active users
# SHUTDOWN=poweroff
# SHUTDOWN=acpibutton
# SHUTDOWN=savestate
#   select one of these shutdown methods for running VMs
#   acpibutton and savestate causes the init script to wait
#   30 seconds for the VMs to shutdown
SHUTDOWN_USERS="" # <- OMG WHY DIDN'T I GET THE MEMO?
SHUTDOWN=poweroff