Before snapping on the disk lock make sure the key is not on the bunch you left in the house..... (no I haven't)
Before riding off make sure the removable luggage is actually locked on properly
If using a on-bike camera make sure the view does NOT include the spedo
If using a plastic bag as a hat make sure no one has a camera
Remember no matter how good your machine looks when you park up there is always someone who will go one better
When parking your bike make it as hard as possible for any git to nick it unless they can do a good job of riding off road