The year before the high back seats were put on Blue Streak, I witnessed multiple incidents of people sitting, or trying to sit, on the top ledge of the car. Most of the time the ride ops saw the person on the lifthill and stopped the lift. You can bet it was directly because of this rider behavior that the trains were modified. I can't say I blame them.
I'd rather be in my boat with a drink on the rocks, than in the drink with a boat on the rocks.