Why is Saturday stronger than Monday?
What's the only room from which no one can enter or leave
What is the difference between a jeweller and a jailer?
By what process could you make a 'Tea-Table' into food?
Why is it very easy to weigh a fish?
On the dull night when the blonde was dozing, she heard an odd clamour and she saw that there was a bizarre man with a gun simply outside her home. So she raced to the telephone to call the police, however, she can't dial 911. Why?
Which flower has two lips?
Four men were in a boat on the lake. The boat turns over, and all four men sink to the bottom of the lake, yet not a single man got wet! Why?
I am quite hot but become too cold if you remove the first two letters. What am I?
Prove that twice of ten is the same as twice of eleven.
Take away my first letter, then take away my second letter. Then take away the rest of my letters, yet I remain the same. What am I?
There is a cryptic organization called Cicada 3301 that posts challenging puzzles online, possibly to recruit codebreakers and linguists.