This is by far the best way to separate egg yolks.
Egg Cracking 101: Crack eggs on a flat surface and never on the edge of a bowl. When you crack an egg on a sharp corner you force egg shell into the egg white which is almost always a pain in the arse trying to get out.
The Chef's Method: Crack an egg into your hand and let just the whites slip through your fingers. This is fastest but the texture is gross and so the bottle method is a fantastic alternative.
