For the complete series go to http://tale2tell.com/after-effects-basics-multi-layer-keying-series-5-tutorials/

In this final tutorial on Keying in AE, I show a simple method to create a light wrap effect that takes the pixels of the background a wraps them around the edge of the keyed item to help make it look like the item is really in the place you have composited it to be in … a really helpful trick to ‘sell’ the shot!