I bought, and used, a Bell Biker in the late 70s, possibly as early as 1978. It lasted until about 1985 when I let go of one handlebar on the most epic mountain bike jump of my life. I smashed it after going over the high side and ended up with “camera motor drive” vision. (Moving my head from side-to-side felt like I was taking pictures with a motor drive).
I smashed a MSR when one of the two dogs I was riding with decided that she was afraid of drainage grates on the road. She stopped, the other dog didn’t nor did I. I remember a might THWACK when my head hit the ground and two dogs jumping over me in a very graceful and beautiful arc.
One of my most memorable car she’s happened with a Bell V1-Pro. I smashed it to pieces when I hit a curb at about 20 mph and did a Greg Louganis dismount...full layout with a pivot on my head.
Since then I’ve smashed so many helmets that I have no idea how many. It could be as high as 20 or 30. With the exception of going over the high side, I have not once lost consciousness in any crash. I remember them in glorious technicolor.