If you have listened to the most recent podcast, they talk about bull semen, this is the story they are talking about, basically......just outside of Nashville a greyhound bus carrying canisters of bull semen "lost some of it's load" while trying to climb a highway ramp. it closed down part of the I-65 during rush hour........here is the full story:
http://www.reuters.com/article/2011/08/24/us-semen-spill-idUSTRE77N4QY20110824
http://www.reuters.com/article/2011/08/24/us-semen-spill-idUSTRE77N4QY20110824