Ankles are good, in that - like all worthwhile joints - they help you to move. Plus, they're handy for use in jokes about how old someone is, as the fetishes of yesteryear (ankles, wrists, knees, post-marital sex), are totally good for a laugh. Ankles are also home to anklets, which are slightly questionable as jewelry, but have a totally bitchin' name. Anklet. Without ankles, we'd all be tottering around like poorly designed robots, which would be hilarious for a couple of days, but would probably get old quick.
However, I twisted my ankle something fierce this morning, so: