[Bumper]

The Official Answers

1. Running out of gas.

2. The campfire circle includes a woman and her brother. The woman's daughter and the man's son are also present.

3. A telephone book.

4. Chinese checkers.

5. Dag Hammarskjold. Dag hammarskjold was the second Secretary-General of the United Nations. The plane in which he was travelling crashed into the jungle. There were rumours at the time that a bomb had exploded, and even that some of the victims were shot prior to the crash. All 16 passengers and crew were killed.

6. The Banana. It's the only one that needs peeling before eating.

7. Ambrosia. The gems are: Amethyst, Emerald ( Emerald City in the Wizard of Oz ), Ruby, Pearl, Diamond, Tiger's Eye, Cubic Zirconium (Fake diamond), Black Opal. Taking the first letter of Amethyst, second of Emerald, etc.. gives Ambrosia - The food of the gods.

8. Neither, it's a paradox. If the first is true, then the second must be false, which makes the first false; it doesn't work.

9. Turn on #1 and #2 only. Wait... Turn off #2. Rush upstairs. The correct switch is #1 if the bulb is lit, otherwise, it's #2 if the bulb is warm, or #3 if the bulb is cold.
Edit: Just read this again. I think the wording in the question is incorrect, since it says "without ever going upstairs", and in the answer it says to "rush upstairs." I guess the question should eliminate the reference to not going up the stairs. Sorry about that.

10. I am an eye.