Rugles - 9:15 pm on Oct 25, 2011 (gmt 0)
In any event, now I print out hotel and pubcon registrations for the times I get idiot customs agents
^^ this is always a good idea. Best to have all your paperwork and intinerary ready to hand over. They are a little sensitive in the USA about people coming in and doing work. Make sure that you make it clear that you are attending a conference.
Like somebody else said, no humour. They do not appreciate jokes or anything they perceive as a bad attitude. "yes sir .. no sir .. thank you ... have a nice day" Never volunteer information, just answer questions directly and honestly.
Remember, these people can ruin your day and your trip just because they want to.