Nuclear war. Rise of fascism. Cylon attack. A sudden realization that the hermit life is the better way.
Preparation is the key to survival. During times of trouble supermarkets will be stocking canned tuna, guns, and bibles. Hardly the ammunition for the recreational vegan. The recreational vegan warrior needs a rich, fatty, buttery fruit in her fight against evil to calm her senses and keep her mind on the goals. So next to your lemon tree, plant an avocado tree. Ideally the plants will be left near your nuclear-attack-proof cellar so that when you run downstairs you can grab the life-saving fruits on your way.
I chose to seed my avocado in water, following these directions.