Here's another interesting factoid about avocados: They have been described by biologists as an "evolutionary anachronism," and it is somewhat mysterious how they managed to not go extinct long ago. Long story short: In order to reproduce and spread, ancestral avocado plants must have co-evolved with one or more land animals that were large enough to swallow the fruits whole, so that the giant undamaged seeds would be dispersed when the animals defecated somewhere far from the tree. However, all land mammals sufficiently large to serve this purpose went extinct in North America some 13,000 years ago, long before the advent of agriculture. Today the avocado is entirely dependent on cultivation for its continued existence, but how it managed to hang in there after the extinction of the giant mammals until the advent of cultivation remains something of a mystery.
Here's a link to an article about this from Smithsonian Magazine, which also includes a few other amusing "avocado facts to drop at your next party":
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