Good Riddles

Question: What is black white black white black white black white?

Question: If you are Canadian when you go into the washroom and your Canadian when you come out of the washroom. What are you when you are in the washroom?

Question: Once you are in my sight, you are gone in a flash, and people tend to use me for cash. I am often used as a dire assist, and people often believe that I cause harm, when I am but its catalyst. What am I?

Question: A man wants to start a forest fire.There are 80 trees and you have a lighter. How many trees should he burn?

Question: What key is playful?