Riddle:
What is often returned but never borrowed?
Answer: Thanks.

Riddle:
What ancient device allows people to traverse through walls?
Answer: Doors.
Riddle:
What is the biggest thing you saw but it doesn't have a shadow?
Answer: The sun.

Riddle:
An old billionaire offers a million-dollar prize to whoever can guess what he is thinking of. Plenty of people tried but they old got it wrong, until one young boy came up. Soon after, the boy walked away a millionaire. What did he guess?
Answer: The boy said, "You are thinking of something you thought I wouldn't guess". The boy was right by technicality.
Riddle:
Which word in the English language becomes shorter when it is lengthened?
Answer: Short.

Riddle:
At night they come without being fetched, And by day they are lost without being stolen. What are they?
Answer: The stars.
Riddle:
What eleven-letter English word does everyone pronounce incorrectly?
Answer: Incorrectly!

Riddle:
What dress does everyone have, but no one wears?
Answer: An address.
Riddle:
What kind of music do aliens like?
Answer: Nep-tunes.
Riddle:
What is type of room has no windows, no furniture and nobody lives in it?
Answer: A mushroom.
Riddle:
A mother had five boys Marco, Tucker, Webster, and Thomas. Was the fifth boy named Frank, Evan, or Alex?
Answer: The answer is Frank. The mother named the kids with the first two letters of the days of the week.Monday is Marco, Tuesday is Tucker, Wednesday is Webster, Thursday is Thomas and Friday is Frank.
Riddle:
What is a comedian's favorite food?
Answer: Pun-cake.
Riddle:
What always was, yet can never be?
Answer: Yesterday.
Riddle:
Tear off one and scratch its head, what was red is now black instead. What is It?
Answer: A Matchstick!
Riddle:
What is the longest sentence?
Answer: Life imprisonment.
Riddle:
What familiar word starts with IS, ends with AND, and has LA in the middle?
Answer: ISLAND.
Riddle:
What kills you inside the more you keep it and sets you free the moment you release it?
Answer: Guilt.
Riddle:
What is in the center of gravity?
Answer: The letter V.
Riddle:
What is it that you ought to keep after you have given it to someone else?
Answer: A promise, of course.
Riddle:
What ends in a 'w' but has no end?
Answer: A rainbow!