Ask A Stupid Question, And You Get A Stupid Answer

Here's a game where you have to answer a dumb question questioned by the person before you. Here's an example:

My Question: Why do aliens live in lampshades?
Someone else's Answer: Because outer space is too dark for them.

Okay, I'll start off. The next person has to answer my question and state another dumb question.
And so on and so forth.

Why do birds fly?