I did that after my first heart attack. Three in the morning, nobody on the road, but I drove to the hospital with one hand on the parking brake, just in case. I figured that I'd get to the hospital before an ambulance crew could get to me.
And the parking brake was supposed to do what? Give you cpr? Call an ambulance if you pass out? Run like lassie and get help? You're not bulletproof you cantankerous old fart. People count on you and people care for you.
/lecture your family really wanted to give you
I hope your parking brake episode was in a front wheel drive car or a heavy old truck. In a RWD vehicle, grabbing the parking brake at speed will cause you to do a 180 with only a small twist of the wheel. We used to do this for fun when I was a youngster.