I am a naturalized citizen and do not carry my citizen papers with me.
One official asked for a 'copy' of my citizenship papers. Told him : 'Read the fine print on US citizenship papers: Not to be copied.'
Another time entering Canada was asked 'where are you from.'
Told the guy : 'Arizona'. He then told me: 'You have a ***? All Arizonans carry a ***.' Told him 'No ***, but I carry a big knife.' He waved us through.
Must be a boring job at times!