Pretty much any one of the US immigration officers I've ever dealt with. I travel out there a couple of times a year on business and I have to say they are the most sour-faced bunch of jobsworths I have ever come across.
Once I get past them all the other people I deal with in the States are really friendly and polite. I think the 'must keep out potential terrorists' thing has gone right to their heads.
Hope they don't read this - I'm out there next week :P
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