Okay, what you have to do is think of a word with one vowel in it, that remains a proper word when you substitute that vowel with each of the other vowels. So, you'll be supplying five different words.
The first step is to do this with a three letter word. Once you do that, the next person has to do four, and so on (but you can't skip from three to five).
Once it gets to five letters, there can be an extra vowel in the word, but the same one must be substituted in all the words.
The winner is the one who eventually gets the longest word, and they will get an amazing prize.