Nothing is better than biting into a ripe avocado mashed into toast for breakfast, but if you only want a slice of one, then the cut half can easily become spoiled after only a few hours.
If my avocado is ripe, I'm eating tacos that night. You can't exactly tell a ripe avocado "no" - they tend to rebel ... Just about anyone can slice the interior of an avocado up into neat pieces ...