Step 1: Make figure 8 loops. Leave about 2 figure 8 loops of wire left to wrap around the middle.
Step 2: Wrap around the middle a couple times. The key to this whole method is crossing the wire over itself in the first middle wrap. Otherwise the whole thing will easily come undone.
Step 3: String the loose end through the loop.
Step 4: Give a quick pull to secure.
Step 5: Viola!