Workers installing thatching as a sunshade over the great ape cages had leaned their ladder against the metal frame suspended over the front of the cages. Things went fine until one of the orangutans reached through the bars and grabbed one of the men by the front of his shirt as he climbed the ladder.
The ladder kept the orang from pulling the man any closer, but the worker, balanced precariously on the ladder, couldn’t do very much to get away. Every time he pulled away the orang pulled him back—smashing his face and chest into the ladder.
Finally, after a dozen or so bone-jarring crashes into the ladder the orang lost his grip and the uninjured, but slightly shaken worker quickly vacated the ladder.