Does it count as a "wrong answer" if they didn't realize it was wrong at the time?
The movie Diner had a clip from G.E. College Bowl that had a question along the lines of, "You're on Mercury, on the side facing away from the sun. How long will it take before the sun rises?", and the "correct" answer was, "It won't come up - Mercury keeps the same side away from the sun, the same way the Moon keeps the same side away from Earth." When Mercury was first discovered, this was thought to be correct, before astronomers started noticing that the side that faced away seemed to alternate; I think it's, for every 2 orbits, Mercury revolves 3 times.