These passengers are sitting on a plane when the pilot comes over the speaker and says "We're sorry ladies and gentlemen, one of our engines has gone out, but not to worry because we can make the rest of the flight on three engines. It will just take an extra hour."
A little while later, the pilot comes on again and says "A second engine has gone out but not to worry, we can make it on two engines. It will just add another 2 hours."
Against all odds, the pilot comes on again and says "We are sorry, but another engine has gone out. Not to worry though, we can make it on just one engine. It will just add 3 hours to the trip." At this point, one passenger turns to another and says "If that fourth engine goes out, we'll be up here forever!"
Submitted by: Rob