Plant some potatoes in a stack of tires.
There are a lot of sites that will give you better particulars about it, but basically you just cut a knobby growth on a potato left in your cubbard too long, make sure it's at least an inch long and looks pretty healthy, white at the tip and green at the base not withered and flimsy (doesn't matter what the parent potato looks like). Set up the first two tires on a clay planting dish at least two inches in diameter bigger than your tires (I used go-cart tires and an extra-large dish and fit three potato plants in it).
Fill the tires with good gardening soil, keeping the mix loose, dig a small hole for each plant (about 3") and cover to level with soil. When the shoots sprout up 6-8" high, add another tire and cover with dirt, leaving 2" of the leaves to bring in sunlight. Repeat until plant is roughly 2' from where it started from bottom to surface or you run out of tires.
Bonus: potato flowers are pretty.
To harvest, after admiring the flowers and mourning their passing (about 2-3 weeks' worth of mourning), gently loosen the dirt around the edges of the plant, trying not to disturb it terribly, snip off the baby potatoes. For bigger tubers, wait longer. Leave potatoes on top of the dirt for a day to dry out and there ya go!
I've grown several varieties they offer at the local supermarket with only one case of genetically engineered non-producing potatoes (not as prevelant as people make it out to be) and no cases of potato pests or disease... then again, I did grow them entirely inside (mostly because the first crop I was going to transplant, but the tires were too heavy to move and then they did so well, I kept the next batch inside).
Whew... that was a lot more long-winded than I thought it would be.
VIVA LA REVOLUCION DE LA PATATA!