New riddles

What happens when you slap Dwayne Johnson's butt?

What is a chicken racing driver's favourite part of the car?

Why is it always so hot in the corner of a room?

I sometimes come in a can but I'm not food. I sometimes come in a bottle but I'm not a beverage. I come in different colors but I'm not a rainbow. I'm sometimes used with canvas but I'm not a tent. I'm used with a brush but I'm not toothpaste. What Am I?

What has two hands and face but no arms and legs?

What is the richest kind of air?

Someone said you sounded like an owl.

I am only useful when I am full, yet I am always full of holes. What am I?

What is black when you buy it, red when you use it, and gray when you throw it away?

While I am in air, I am not in oxygen. I am also in water, but not in hydrogen. I am necessary in all animals, but you won't find me in the zoo. Look in all brains and you'll find me there too. What am I?