One day a blonde was riding on an airplane. There was a loud noise that came from outside the plane. The captain came on the intercom, "Attention passengers, we just lost one of our engines; but don't worry, the other three engines will keep us up. Also, we will arrive at our destination about an hour behind schedule."
Half an hour later, another loud noise sounded from outside the plane. The captain once again came on the intercom, "Attention passengers, do not be alarmed. We lost another engine, but the other two will still keep us flying. We will arrive at our destination about three hours late."
After the captain said this, the blonde leaned over to the passenger next to her and said, "If those other two engines go out, we'll be up here forever."