I just realized something.... You know how when you have 'a' before a word starting with a vowel you say 'an' instead? You don't do it with words starting with a 'u' even though 'u' is a vowel! Intereshtink... Well.. ok so there ARE some words that start with 'u' that have 'an' before them, but any of them that have a 'you' sound rather than an 'uhh' sound don't use 'an'.