Microwaves & Cats

It was a long time ago. The stone age people had just invented the microwave.
If you thought the wheel was first, you are wrong.
One day, the stone age people (all of them) sat happily around the bonfire, wondering what to do with their freshly invented microwave.
A cat walked by. She enviously frowned at the microwave, even though she had no idea about the purpose of this strange new device.
 So what did the stone age people do? Since they had curious, but unemotional minds, they stuffed the cat into the microwave.
The stone age people were lucky. 
Electricity did not exist yet.
So nothing happened.
Nobody died. 
And they all did: "Uga uga uga"