Mad cows?

Omg somone help me i am suffering from lack of knowlegde! I honestly am. Can somebody inform me of this mad cow disease? I dont understand it! I try hard to get it but it doesn't click. So Cows have gone mad? ahh please help! Mad Cow, Sara
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Sara we shall have a topic of mad cow disease sometime tomorrow.
Why is psm called "pms"?
because mad cow disease was already taken.
I'm kidnapping your puppy at the moment.
[Anonymous]