Show It Off
Among other uses, this knot is great for hanging a food bag to keep out of reach of animals.
To do so, tie a bowline knot on a long rope, and throw the rope over a branch high above you at least 200 feet from camp.
Attach your food bag to the knot (carabiners work great), and pull the bag up, so it's at least 12 feet up and 6 feet from the tree.
Now secure the other end to the tree, and sleep easy knowing you saved the food.