Falling from an airplane is easy stuff. I like the 4-stroke motorcycles that have the sound of a 2-stroke engine dubbed in for effect. You just don't get a bbraaaaap sound from a thumper.
The original Rambo movie was great when John J. was riding the 4-stroke Yamaha XT-250 but they made it sound like a 2-stroke. Here's the best 3 minutes in the history of cinema