I know that apparently, some American travelers put Canadian flags on their luggage or carry on then claiming they’re from Canada (the dead giveaway on debunking this is their passport, since how can you be “Canadian” when you have US citizenship unless you’re a dual citizen in possession of both nationalities) since some of them have hatred towards the US or feel ashamed of the country due to its internal affairs.
I’m not a liar, but I can see the appeal. Luckily, I also have an EU passport to hide behind, should I want to. Also, other Americans should know that there are many tells that will out them if they try.