Zebras

There are tow zebras and they wanted to know if they were white with black stripes -or- black with white stripes.  So one of them goes and asks God.

God replies "You are what you are".

So the zebra tells his friend "We are white with black stripes". 

The other zebra asks how he knows and he replies:

"God said 'You are what you are.' if we were black stripes he would have said 'You is what you is.'.