You can find other riddles at: http://wiki.answers.com/Q/What_is_considered_the_hardest_riddle_in_the_world gap The World's Hardest Riddle. It's Apparently Still a Riddle... There seem to be various contenders for what is considered the hardest riddle in the world. Here are some brain-twisting responses from WikiAnswers contributors: 1) I turn polar bears white And I will make you cry. I make guys have to pee And girls comb their hair. I make celebrities look stupid And normal people look like celebrities. I turn pancakes brown And make your champagne bubble. If you squeeze me, I'll pop. If you look at me, you'll pop. Can you answer this riddle? - 97% of Harvard graduates couldn't answer this, but 84% of kindergarten students could (in less than 6 minutes). Answer: The answer is "pressure," although some people have argued that the answer is "time" because it refers to the following poem. The simple answer is either Yes or No, because that is what the question literally asks, and kids would give up sooner. Time The time has come, winter is here and those yellow bears disappear. The time has past as man looks back with a sigh and a tear in his eye. As time is held boys cross their legs but of course the toilet begs As time marches on Girls loose their blush and swap a comb for their brush As time passes For those held high their end is nigh As time catches up Everyone is equal when we get to the final sequel As time turns Without it we have flour and water With it we have breakfast for my daughter As time revolves into something so fine As time runs out The more in a minute you try and squeeze the less you can do with ease. As time ticks All the time that has past man cannot comprehend something so vast.