What is the riddle which can be asked all day with a different correct answer each time.

What has 13 hearts but no other organs?

You order chicken wings at KFC in the boxes of 6, 9 and 20. What is the largest number of wings that you cannot obtain by buying in any combination of the boxes?

Kareena is older than Katrina and younger than Karishma. Isabelle is younger than Bipasha and Karishma. Bipasha is older than Karishma. If Kareena and Isabelle are the same age, who's the youngest?

How many people must be gathered together in a room, before you can be certain that there is a greater than 50/50 chance that at least two of them have the same birthday?

When is the top of a mountain similar to a savings account?

It comprises roots which nobody sees,
Much taller than those trees,
Up and up it goes,
Still it never grows?

One is to three as three is to five and five is to four and four is the magic number.
What is the pattern?

What is the next number?

77, 49, 36, 18 ?

What can run but never walk, have a mouth that never speaks, have a head that never weeps, and have a bed but never sleeps?