My other half taught me the correct method.
Take one half of said fruit, and a sharp knife.
Hold avocado in palm of hand, stone up in the middle.
With the knife, strike down flat blade against the stone, so it basically cuts into it, like chopping a carrot I suppose.
Whilst it's in there, turn the knife, twisting out the stone.
Works every time.
[/the land of avo's]