Classic Riddles
Riddle: You are in a room that is completely bricked in on all four sides, including the ceiling and floor. You have nothing but a mirror and a wooden table in the room with you. How do you get out?
Answer: You look in the mirror you see what you saw, you take the saw and you cut the table in half, two halves make a whole, and you climb out the hole.
Riddle: If you're in a room with no windows, no doors, and everything made of cement. In the room is a mirror and a table. How do you get out?
Answer: Look in the mirror to see what you saw. Take the saw the table in half.  Use the two halves to make a whole.  Then, crawl through the hole to get out.
Riddle: What can be heard and caught but never seen?
Answer: A remark.