Line or spray with Pam a large crock pot and place roast inside.

Pour the root beer over the top (it should come at least half-way up the roast).

Cook on low for 8-10 hours and meat is falling off the bone.

Remove from crock pot onto 9x13 pan (I use my pyrex).

Preheat oven to 400 degrees F.

Using two forks shred roast while still hot (don't let it cool down or it will be a lot harder to shred).

Pour barbecue sauce over the top of meat and mix into meat.

Place in hot oven and cook for 20-40 minutes (enough for the top and edges to start to brown a little extra.

Remove from oven and serve on toasted buns or rolls (although you can use untoasted rolls, they fall apart easier).