I'm watching an old episode of You Can't Do That On Television. It's the Popularity episode from 1982. Christine 'Moose' McGlade said "I don't know" and didn't get slimed!
For those who don't know, on You Can't Do That On Television if you ever say "water" or "wet" you suddenly find yourself doused in water from above. If you ever say "I don't know" you get slimed. But it didn't happen this time.
You can download the episode at Barth's Burgery.