Use Your Intuition.

Lets say you're out at a bar. Maybe a pirate themed bar. The service is pretty rough cause they've just opened and you have to get your own drinks from the bar despite the fact that the pattio is sposed to have servers. And said bar itself is pretty sad cause there's only like 8 half full bottles behind it and the bartender is feeling a little overwhelmed by his 3 patrons. You're waiting around for the tab and notice a big jar of what looks like oyster crackers soaking in water. Or maybe chicklets in spittle. After a bit of convincing the bartender explains that they're beans, and yes, they are for eating. He finds the long spoon and dips you out a saucerful. The offwhite surface gleams as whatever the hell these beans were in drips off. They're surprisingly firm considering it looks like they've been soaking for years. Then again, this place just opened. How old can they be? You may be thinking to yourself "I don't think I wanna eat this." And you're right. They taste like balls. Salty, unwashed balls. And you're not sposed to eat the outter casing so the flavor spreads and lingers over every last tastebud as your tounge wincingly steps up to peel the rank little bastard. Sometimes you can just assume the worst and don't have to try it for yourself. Learned the hard way? Definately.