No specific recommendation. Just stay calm and collected.
IF you find that you are totally stuck and there's no way you'll ever pull the answer out of your "fourth point of contact" (if you're Airborne, you get that), do NOT say "I don't know." Say something profoundly stupid with the straightest face you can muster, smile, and go have a seat. No one will remember "I don't know boy" but people will remember you. ;-)
For example... if you're totally stuck on the capital of some obscure place and you know you're going down in flames, confidently repeat the name of the country/state/province/whatever and add "City."
From the former Louisiana State Trivia Bowl Champion (er... 1981ish), Good Luck, Man!