Here's an idea - "Famous Last Words". It can cover any era, any character, any ship, and be serious; a different take on Kirk's "Oh my..." at the end of GEN - or funny; a shot of a Klingon ship's engine room overrun with tribbles, referencing Scotty's line at the end of TTWT.
In which case, I think it best if no one among the contestants mention what you think you might do as a challenge while voting is on. I'd hate to see either a contestant exploit this potential, or to see a worthwhile challenger be robbed of a fair shot because he or she didn't play the "Clarke card." Let's not forget, it's the winner's choice of challenge, not the voters'.