I got grabbed by a CRS after filming a guy getting dragged away behind police lines, and he told me to delete the video. First I pulled the American card, telling him I was a tourist so what did it matter, but he persisted. Considering his firm grip on my shoulder and knowing that my french isn't good enough to argue him down, I deleted the video.. still regret not standing up for my rights more.

Moral of the story: way to get out of it.