Good Riddles

Question: What goes around comes around?

Question: I can hurt you unbearably and can't be touched. What am I?

Question: You come across a Native American tribe and the leader wants to kill. He tells you, you can say your final words. If you tell the truth you will be burned at the stake. If you lie he will shoot you. What do you say to ensure survival?

Question: I am shorter when I stand and taller when I sit.
Sometimes I'm even called a pit.

What am I?

Question: Paul is 20 years old in 1980, but only 15 years old in 1985.How is this possible?