You are given a candle, a book of matches and a box of tacks. You need to mount the candle on the wall in such a way that the candle won't drip on the table below it.
When the problem is presented as above people struggle to come up with a solution. When you simple changes the description of what you are given to: "You are given a candle, a book of matches, a box and some tacks." people are able to quickly solve the problem.