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.