Mark Twain once said,
"I built a cage and in it I put a dog and a cat. After a little training I got the dog and the cat to the point where they lived peaceably together. Then I introduced a pig, a goat, a kangaroo, some birds, and a monkey. And after a few adjustments, they learned to live in harmony together. So encouraged was I by such successes that I added an Irish Catholic, a Presbyterian, a Jew, a Muslim from Turkestan, and a Buddhist from China, along with a Baptist missionary that I captured on the same trip. And in a very short time, there wasn’t a single living thing left in the cage."