The Commandant of a German concentration camp addressed the prisoners on parade one morning. He said "Today I have some good news and some bad news. Which do you want first?". "THE GOOD NEWS!" the prisoners shouted! The good news he said is that today you will get to change your underwear. At this the prisoners cheered. Then a loud voice called out "What's the bad news?" The commandant replied "Cabin A will change with Cabin B and Cabin C will change with Cabin D!!"