Here's one I heard today:

[woodscrkhermit]

Bananas are radioactive. A radiation exposure of eating 1000 bananas increases your risk of death by about one in one million-the same risk as eating 40 tablespoons of peanut butter, or of smoking 1.4 cigarettes.

The radiation levels in Japan spiked up to 30 bananas on the 13th, but are back down to 1 banana per day.