I once fell off a treadmill.
Hit emergency stop, you say?
It. Did. Not. Work.
Despite losing all the skin on my shins, I still refused to let go for fear of being propelled at a high speed at the bikes behind me.
Luckily, the treadmill finally stopped and I regained my composure but never my pride.
Thankfully, this was before smartphones. Others aren't so lucky.