See? Easy as pie!
Jean-Pierre Hallet, a one-time Belgian colonial official in Central Africa, believed that just about any animal could be won over with kindness and patience. To prove it, he tamed an adult rhinoceros. He named it Pierrot and used to ride on its back. There was also a ball game they could play together. We’ve seen several videos of baby rhinos playing with humans: maybe they don’t grow out of the urge to play.
Hallet wrote some best-selling books in the 1960s, and I had the pleasure of meeting him. He was a very big man. Maybe the rhino should’ve been riding him.