Please don't harm the cat. That's animal cruelty. How would you like it if you had no idea what you were doing wrong and someone smacked you with a baseball bat for doing it?
There are two cats that sleep on my car and I haven't seen any signs of scratches yet, but my car needs a paint job anyway so i don't worry too much. Get yourself a car cover then you and the cat can be happy.
As for EZRIDN's comment about buying an LS1...
No, the paint doesn't scratch. It flakes off and leaves these nasty looking bare spots all over the car. This knowledge is based on experience. Although it was not an LS1, it was a Chevy.
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90 Mustang LX 5.0
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