Why Did The Chi... ?

Go through the letter maze whilst spelling out a joke question, starting at the W and ending at the question mark. You can travel in any direction the paths permit, and can even cross over your route, but once you pass a letter in the maze you cannot return and re-use it. The maze hides four joke questions. All start with: "Why did the chi...?" but three of the questions have a letter missing. Your task is to locate the only fully-formed question and correctly match it to one of the four potential punchlines.

The fully-formed question is: ?
The correct punchline is:

Please fill both boxes input above. Enter your answer attempt in lower case, without punctuation, using hypens instead of spaces. Example: charlie-and-the-chocolate-factory instead of Charlie and The Chocolate Factory. To submit your answer attempt, click the Submit button. Do not press enter or return.

This puzzle was created by MD1500. (C)2007. A version of it also appears on Perplex City - We love Puzzles. It may not be used elsewhere without express permission of the creator.
It may utilise code elements and concepts (C)Rod Bruinooge, Abject Modernity, James A. Irwin and Mark Butler.

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