Motorcyclist pulls drinking mug from bumper of moving car

I have to admit, I’ve walked back to the fire engine after going to an emergency call to find a coffee cup on the inside corner of the tailboard. Tailboards are generally larger and a diamond plate surface, but its still amazing what will stay there while going around corners. The POV of the camera kept freaking me out since I felt like I was driving the motorcycle, but someone kept jerking my head around LOL. Was it truly that dangerous? I think the speed of the vehicles is hard to actually gauge due to the wide angle nature of go-pro type cameras.