You would expect AutoComplete to "complete" the phrase you are typing, but instead it "suggests" based on the characters you are typing.
For example: http://jqueryui.com/demos/autocomplete/
When you type "a" in the input box:
I expect it to "complete" and display: ActionScript AppleScript
Actually, it "suggests" and displays any word that contains that letter.
Here's an example on how you would expect it to work: http://developer.yahoo.com/yui/examples/autocomplete/ac_basic_array.html
How would you get jQueryUI autocomplete to work like that?