If you say my name, I will no longer exist. What am I?

John’s parents have three sons: Snap, Crackle, and what’s the name of the third son?

What time is it when an elephant sits on a fence?

What has 88 keys?

A thief is convicted in Mexico. He gets the death penalty. The judge allows him to say the last sentence to determine how the penalty will be carried out. If the thief lies, he will be hanged, if he speaks the truth he will be beheaded. The thief tells the last sentence and to everybody's surprise some minutes later he is set free because the judge cannot determine his penalty. What did the thief say?

Two men play a dice game involving roll of two standard dice. Man X says that a 12 will be rolled first. Man Y says that two consecutive 7s will be rolled first. The men keep rolling until one of them wins.

What is the probability that X will win ?

If 5 cats catch 5 mice in 5 minutes, how long will it take one cat to catch a mouse?

Count the number of squares in the picture below.

I am eight letters long - "12345678"
My 1234 is an atmospheric condition.
My 34567 supports a plant.
My 4567 is too appropriate.
My 45 is a friendly thank-you.
My 678 is a man's name.

What word am I?

What can run but never walks, has a mouth but never talks, has a head but never weeps, has a bed but never sleeps?