Common sense and a sense of humor are the same thing, moving at different speeds. A sense of humor is just common sense, dancing. -- Clive James

Pentagon Humor!
A young officer is working late one evening. As he comes out of his office about 8 PM he sees the General standing by the classified-document shredder in the hallway, a piece of paper in his hand. "Do you know how to work this thing?" the General asks. "My secretary's gone home and I don't know how to run it." "Yes, sir," says the young officer, who turns on the machine, takes the paper from the General, and feeds it in. PAUSE
"Now," says the General, "I just need one copy..."

A politician (or a lawyer) awoke in a hospital bed after a complicated operation, and found that the curtains were drawn around him. "Why are the curtains closed," he  said. "Is it night?" A nurse replied, "No, it is just that there is a fire across the street, and we didn't want you waking up and thinking that the operation was unsuccessful."