We saw today why it's important to always double-check the release valve on a heated tanker truck full of driveway tar. But as roadway spills go, tar isn't up there with the most unexpected stuff. What's the weirdest highway spill of all time?

We're going with bull semen. Earlier this year, a load of bull semen packed in dry ice was found by the roadside, after drivers complained of a particularly rank odor. Where'd all that bull-kakke come from? From the cargo hold of a Greyhound bus that was transporting it. Apparently in the bull-jizz world, using FedEx is out of the question.

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