If you are interviewing/debating with them, you must use the hammer-and-anvil approach, similar to the Socratic Method. Bold is neccesary, all else is optional. First, slouch to appear small, make Bambi eyes, use a squeaky-soft voice and, above all, appear like an innocent little six-year-old. Act ignorant about their argument and have them explain. That's setting up the anvil.
When they're into the talking points, hit them with the hammer- return to your regular voice and behavior and slam down the facts.
Selectively playing dumb will get you everywhere.

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I want to go back to the moon.
I don't care which rocket you use, whichever one you pick, I'll like it, I swear.
"If you think the LHC will create black holes, you might as well believe Hobbits are at the bottom of your garden."- Dr. Mike Inglis
Rovers forever! - ToSeek