How does linux stack up to its competitors? Here are three different comparisons that seek to answer this question: Linux VS Your cat, Linux VS Your Grandmother, and Linux VS The Soviet Union. Who wins? I'll leave that up to you.

Linux VS Your Cat

Linux is free!
Your cat may have been free.
Linux can go years between shutdowns.
Your cat spends more time asleep that it does awake.
Linux does a kernel panic when it encounters something it doesn't understand.
Your cat poofs its fur up and hisses when it encounters something it doesn't understand.

More Here.