To prepare for his memorable role as Gollum in Peter Jackson's The Lord of the Rings series, actor Andy Serkis would go on very long walks on all fours. He shared this anecdote with The Guardian, and as you can imagine, he worried what people might think. So when he came across someone on an all-fours walk, Serkis pretended like he was looking for something.

"I used to walk on all fours off set when we were filming Lord of the Rings," he said. "I spent a lot of time in preparation for that [as Gollum]; I would go off for walks on all fours for hours. I did occasionally come into contact with other people, so I just had to pretend I was looking for something. It's fair to say that's pretty method."

Serkis was praised for his role as Gollum, and specifically for how it helped demonstrate the viability of a human actor portraying a creature with a mix of motion capture and CG. After The Lord of the Rings, Serkis would go on to play other CG characters like Caesar in the new Planet of the Apes movies, as well as Snoke from the Star Wars series. Serkis also played King Kong in Jackson's movie of the same name, while he portrayed Baloo the bear in his own take on The Jungle Book called Mowgli: Legend of the Jungle.