They warned us not to eat the berries or the mushrooms in Ukraine. I didn't listen to them. The only effect I ever noticed was persistent light-headedness. This could have been a result of me consuming radiation or the copious amount of vodka I drank. I'm still not sure. Regardless, those Soviets fucked up bad with Chernobyl. Check this out: http://xkcd.com/radiation/ Really interesting perspective.
I've also come across this interesting video, which also puts it all in perspective, but in a totally new way. It's long, primitive, but informative.