Heather Graham and WIll Farrell are a couple sitting on one side of an airplane. Terri and Chris are a couple on the other side. Heather gets up to go to the bathroom leaving Will alone. Terri gets up to get something out of the overhead bin; the plane experiences some turbulence and Terri falls in Will Farrell's lap. Heather comes out of the bathroom to see Terri in Will's lap. She gets jealous and jumps in Chris's laps. Terri says something like, "take this" and jumps again in Will's lap but this time butt-side up as if she is asking for a spanking. Unfortunately, Will doesn't do anything. However, next thing that happens is that Terri and Heather start poking each other and then start slapping each other on the butt while standing in front of each other. I'm forgetting some of the scene, but at the end Heather turns around with her hands on the airline seat, her butt is up in the air moving in a humping motion, she's yelling something while Chris and Terri slap her on the butt. Terri had one butt cheek and Chris was slapping the other. I'd say medium intensity, but it's been awhile since I saw it. I've never seen it replayed anywhere else.