Back when I worked for Mozilla, I often had to travel to the Toronto office for team meetings (most of the team I was on was remote). I always had to carry a l

Back when I worked for Mozilla, I often had to travel to the Toronto office for team meetings (most of the team I was on was remote). I always had to carry a letter to give to CBSA at the Canadian border, explaining the difference between Mozilla US and Mozilla Canada, that I was an employee of Mozilla US and would not be paid by Mozilla Canada, that I would not do any work for Mozilla Canada, and in fact (I loved this bit) that I would not be "working" (whatever that legal term meant) at all while in Canada, only attending meetings. We used to joke that we couldn't fix bugs while at those gatherings, since that would be work and put us in violation of what the letter said.