Most of us know how to separate the egg yolk from the egg white.  There are several ways to do it.  You can pour the yolk from one half of the egg shell to the other, you can strain the yolk through your fingers, or there are even utensils you can buy to do the job.

This is probably the most amusing way I've ever seen to separate an egg yolk, granted you may only need this if you're separating several of them, like for an angel food cake.