> and about not angering the agents more than you plan to
When I was a teenager (long ago at this point), I got into an argument with a police officer over surfing in a certain area. It was pouring down rain, so he was annoyed he had to sit outside and wait for my friends and me to come to shore. Once we got in, he was telling me that he could take my surfboard and my car, and all other craziness. Being the dumb smart-ass I was at the time, I laughed and told him he was full of shit, among other things. He went to take a swing at me but his partner grabbed him.
We all go to court and the judge immediately dismisses the case against all my friends. I had a lawyer with me that I knew and he went to talk to the cop and when he came back over he goes "I don't know what you did, but that cop hates you." I get up in front the judge and he praises me for understanding the law (and I could still see the cop was visibly pissed), but then says he can't have me disrespecting and being a smart-ass to his cops and gave me community service that once completed whatever the ticket was would go away.