So I woke up this morning, and I really wanted fruit. I dug through the fridge - no juice, damnit - but I found two plums. They were only, oh, five or six months old. But they didn't look bad. Maybe a little squishy, but no mold, and generally rather firm.
My mind said, "Don't do it!" but I took the plunge and ate one. I'm telling you, I really wanted fruit.
I'm not feeling so well now.
Lesson learned: If you think it might be bad to eat, it's probably better not to eat it. Listen to your instincts, cravings be damned.