The Mars Reconnaissance Orbiter will monitor the encroaching ice cap from above, @BrianFinifter. I won't see it (darkness will get me first)
Or, to put it in the elderly relative terms aforementioned:
This will probably be my last Christmas with you kids.
I can only hope that some wag makes sure, at some point, to have Phoenix twit "So c-c-c-c-c-c-old." Other options would include the famous line "I'm going out for a walk" (that one's tricky, you'd have to try to time it just right, just before the craft goes silent), or, given the U of A angle, "Tell the team -- tell the team to bear down."
Actually, now that I think about it, I think the one I'd do, if I were the web elf in charge of such things, would be this for a final line:
My God, it's full of stars!
Feel free to share your favorite possibilities!