In light of the upcoming community Scripting Games, I have a PowerShell brain teaser for you.  

Query: In PowerShell, when is the following statement true? Explain why.

     ( $a -eq $b ) -ne ( $b -eq $a )

Submit your answer as a comment, or post it on your own blog and provide a link in the comments of this post.  The best explanation (as chosen by me) will receive a complimentary single-user license for SeeShell (a $249 value).  You have until April 16, 2013 to submit your answer; the winner will be announced April 17, 2013.