I was out snapping birds yesterday when I met a guy coming the other way carrying a D500 on a tripod over his shoulder, with a Nikkor 500mm f4 and a x2 multiplier stuck on it.
He was a great bloke - gave me plenty of tips and told me how, recently, somebody had tried to grab his rig. He ended up being dragged along the ground for some distance but would not let go of his camera. They thief eventually fled the scene.
I congratulated him on his victory.