Two cows were grazing peacefully in a field when one cow turns to the other and says, "Hey, did you hear about that outbreak of mad cow disease?"
The other cow replies, "Yeah, I heard about it. But I'm not worried. I'm a helicopter cow."
Confused, the first cow asks, "What's a helicopter cow?"
The second cow smirks and says, "Well, if there's a mad cow disease outbreak, I'll just fly away!"