This riddle is a bit different, but it's fun (besides, I'm running out of the lateral thinking puzzles that I prefer). Here goes:
What word contains all five vowels: a, e, i, o, u -- but only has 7 letters total?
It's not a trick question or anything. There really is such a word -- and it's one I'm pretty sure you know.
NOTE: The correct answer has been guessed. To read it, see the comments section.
Lateral Thinking Puzzlers by Paul Sloane has lots of classic riddles, clues and answers. Click here to order it.