I think this is from the Paula Deen show (I'm really not sure) but it's very simple and tastes great!

1 4-5 pound Pork Butt Roast
1 Tablespoon seasoned salt
1 tablespoon garlic salt
1 tablespoon pepper
4 tablespoons liquid smoke
1 large sweet onion, sliced into rings
1 cup water

Mix the dry seasonings together in a bowl. Rinse the roast off and then hit with the liquid smoke, rubbing in where crevices are. Sprinkle on the dry seasoning and rub into meat. Pour the 1 cup of water into crock pot and then place the meat in being carful not splash water every where. Cover in your cut onion, place the lid on, set the heat to low, and allow to cook for 7-9 hours. When you pull it out, just shred it up with a couple forks and serve on buns with some (homemade) barbecue sauce.