Ditto. Also in traditional doctrine it was good because the fall led to jesus. Look up felix culpa on wikipedia. As for the mushrooms, it's not as if medieval clergy didn't have a good time.
Plus, there are several translations of it. The common rendition into English is 'happy fault', which may be too positive. The other translations include 'lucky mistake', 'happy mistake', blessed fall, etc. Note again the duality, the paradox, and that the fundamental noun (fault, mistake, fall) is negative. It's a paradox, a mystery, meant to get you to think deeper, not some stunning endorsement of listening to Satan.