What question can you never answer yes to?

(a)  

There’s a one-story house in which everything is yellow. Yellow walls, yellow doors, yellow furniture. What color are the stairs?

(a)  

A man who was outside in the rain without an umbrella or hat didn’t get a single hair on his head wet. Why?

(a)  

I shave every day, but my beard stays the same. What am I?

(a)  

You see a boat filled with people, yet there isn’t a single person on board. How is that possible?

(a)  

What can’t talk but will reply when spoken to?

(a)  

Where does today come before yesterday?

(a)  

What invention lets you look right through a wall?

(a)