Well, they're Southern people, and if they know you are working at home they think nothing of walking right in for coffee. But they wouldn't dream of interrupting you at golf.
There is $1.4 billion a day in trade that goes back and forth across the border. That means millions of jobs and livelihoods for families here in Canada and for families in the United States.
Chemical and biological attacks are scary and will kill a lot of people but don't rise to the level of nuclear.