Two Blondes and Two Mice

There were two blondes as roommates and they both bought mice. When they got home the first blonde said, "How are we going to tell them apart?"
The second blonde said, "Why don't we take one and chop off one of its legs?"

But during the night the mouse with four legs said to the mouse with three legs, ''That's not fair -- I want three legs too.'' So the mouse with three legs told him to eat one of his legs. And so he did.

The next morning the blondes were upset about this so they did the same thing as the day before. But again the mouse with three legs ate one of his legs. This went on until both mice had no tails and legs. Then one of the blondes shouted, ''All right, that's it! You take the black one and I'll take the white one!''