# Difficult short riddles

## The sequence

1 11 21 1211 111221 312211 What is the next number in the sequence?
The next number it: 13112221. Each number describes the previous number. Starting with 1, the second line describes it 11 (one 1). Then the third line describes 11 as 21 (two 1’s). Then the fourth line describes 21 as 1211 (one 2, one 1). This is the pattern.
68.81 %

## Difficult pop quiz

A teacher decides to give a pop quiz one day but all of her students refuse to take the quiz thinking that the teacher will call off the quiz. She can give only one of these students a detention for skipping the quiz. All of the students know each other’s names and if a student knows he/she is getting a detention they take the quiz. How can she threaten her students with the single detention so they all take the quiz?
She tells them that she will give the student who skips the quiz whose name comes first alphabetically a detention. This student won’t skip because they know they are getting a detention if they do. The next person alphabetically will then know that they will get a detention so they won’t skip either, and so on.
79.95 %

## Who am I?

Alone I am 24th, with a friend I am 20. Another friend and I am unclean. What am I?
The letter 'X'. It is the 24th letter of the alphabet, XX in Roman numerals is 20, and XXX is a label for movies that are very inappropriate (unclean).
68.04 %

## I have keys but no locks

I have keys but no locks. I have a space but no room. You can enter, but can’t go outside. What am I? I have a space but no room. You can enter, but can’t go outside. What am I?
A keybord.
66.18 %

## Not a snake

What has an eye but can not see?
A needle.
84.15 %

## Number one

How do you make the number one disappear by adding to it?
Add the letter 'G' and it becomes Gone.
89.19 %

## I'm rarely still, but I never wander

I am a mother and a father, but have never given birth. I'm rarely still, but I never wander. What am I?
Tree.
80.74 %

## Runs forever, but never moves at all

This old one runs forever, but never moves at all. He has not lungs nor throat, but still a mighty roaring call. What is it?
A waterfall.
87.19 %

## The thunder comes before the lightning

The thunder comes before the lightning; the lightning comes before the clouds. The rain dries everything it touches.
A volcano.
80.29 %