1) A doctor and a bus driver are both in love with the same woman, an attractive girl named Sarah. The bus driver had to go on a long bustrip that would last a week. Before he left, he gave Sarah seven apples. Why?

Because "An apple a day keeps the doctor away!"

2) There are 20 people in an empty, square room. Each person has full sight of the entire room and everyone in it without turning his head or body, or moving in any way (other than the eyes). Where can you place an apple so that all but one person can see it?

On one person's head.

3) What is special about the number 854917632?

Dan already got this.

4) A man and a woman are driving along a country road on a cold winter night when the car breaks down. Before leaving to find help, the man tells the woman not to open the doors or windows and not to let anybody in. He leaves, and she does as he says. When he returns, she is dead and there is a stranger in the car. What happened?

I'm guessing there was sombody else already in the car.

And finally...

5) Doctor says to lawyer We were born on the same year, month, day, and minute. We were born in the same hospital, hospital room and we have the same 2 parents. We are not twins and we have no brothers. Explain this.

One of them is a female.

Have fun