This is done in the crockpot and very tasty. You could do it with other meat besides chicken too.
6 chicken breasts
1 12 oz bottle BBQ sauce (the better the stuff, the better the end result)
1/2 c Italian salad dressing
2 tsp Worcestshire sauce
1 tsp liquid smoke
1/2 c Coke
Place all the ingredients into a crockpot and cook on low. After 4 hours, open and take 2 forks to shred the chicken roughly. Cook another 4 hours. Shred chicken a little finer and get the larger chunks of meat down to bite size. Serve on buns, baked potatoes or over rice. Freezes well.