I just watched this again with my daughter, Justice League Unlimited which she got for Christmas on DVD, and kind of forgot just how good it is.  So, I figured I'd post.   
 
What's your favorite moment?   
 
Let's see, I have a couple that come to mind right now... 
 
When Flash and Lex Luthor switch places and Flash-Lex is made to "rest" by Tala.  The next scene, she's all google-eyed!  That always makes me grin and I'm glad my 12 year old doesn't get it.   
 
And the last episode where Superman tells Darkseid he offers a rare opportunity to really turn loose...always a winner.  And it's true.   
 
So, do you have one?  I'd love to hear it.  

  
I got more but this should do

The episode where Solomon Grundy dies against Cthlulu was awesome.