I was actually on an airplane this past weekend when this happened. I was sitting down and yawned. I actually usually cover my mouth, but this one time I didn’t. The guy to my left looks at me all offended and tells me to cover my mouth when I yawn. WTF? This guy also during the flight was reading what looked like an art book on watches. A hardcover book that belonged on a coffee table. I yawned several more times during the flight (I was very tired) sand mouth coverage.