I ask Joseph to pick any 5 cards out of a deck with no Jokers.

He can inspect then shuffle the deck before picking any five cards. He picks out 5 cards then hands them to me (Jack can't see any of this). I look at the cards and I pick 1 card out and give it back to Joseph. I then arrange the other four cards in a special way, and give those 4 cards all face down, and in a neat pile, to Jack.

Jack looks at the 4 cards i gave him, and says out loud which card Joseph is holding (suit and number). How?

The solution uses pure logic, not sleight of hand. All Jack needs to know is the order of the cards and what is on their face, nothing more.

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

By including only four matchsticks in below picture, you have to make "Four Triangles And Two Squares"

What demands an answer, but asks no questions

What's the only room from which no one can enter or leave

If six children and two dogs were under an umbrella, how come none of them got wet?

The more of this there is, the less you see. What is it?

Can you solve the below tricky visual equation?

How can you spell "White of an egg" in one word?
Hint: I know you can spell coke, poke, and joke.

The person who makes it has no need for it; the person who buys it has no use for it. The person who uses it can neither see nor feel it. What is it?