Answer:
How do you make the number one disappear by adding to it?
What goes up and never comes down?
On which day of the year do fewest people die?
Two fathers and two sons are in a car, yet there are only three people in the car. How is this possible?
What can you stick between a 3 and a 4 so that the result is more than three but less than four?
I stand in one place yet fill the whole room. I can be filled with molten rock and come in every hue. What am I?