Step 1:
Cut a ripe avocado lengthwise around the pit and then twist the halves in opposite directions.
Step 2:
Tap the exposed pit with the heel of a chef's knife. It will pull out from the avocado. Carefully push the pit off the blade of the knife.
Step 3:
You can chop the avocado right in the skin by crosshatching it and then scooping the little pieces into a bowl with a spoon.