>>Paying the bills and opening other official looking mail from the past week, I just got a smile from this one. It is from the U.S. Census Bureau and warmly addressed to "TO RESIDENT AT...." Wait, it gets better. This is not the new census form, which I have read will be much less time consuming than earlier ones. No, this is just a heads up. Here is the beginning:
>>
>>"Dear Resident:
>>
>>"About one week from now, you will receive a 2010 Census form in the mail. When you receive your form, please fill it out and mail it in promptly."
>
>This mean you're supposed to try it on and, if it doesn't fit, put on weight till you do?
>In UK we fill IN forms.
>

"Fill out" is fine here. We all know there are lots of small usage differences like this. "In hospital" vs. "in the hospital," for example.

There are even differences within the U.S. In most of the country we get in line. In New York they get on line. You join a queue.