I went to see Indy IV today so you won't have to.
Non-spoiler version - it was co-written by George "I want to take a dump on all your childhood memories" Lucas.
George, you are a rich man. I want talented people to come to you with the idea for a new movie. I want you to take out your checkbook and write them a check. Then I want you to drop the pen - that last part is very important. The only thing I want you to write from now on is your name on a check.
Context will give you the even funnier spoiler versions, but only if you'll throw the whip.