We actually divorced once over the airplane/treadmill argument.  (Preemptive response to the inevitable threads arguing about it:  you're all wrong on the internet.)

"Still Raw", by Randall Munroe, licensed under Creative Commons Attribution-NonCommercial 2.5 License

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We actually divorced once over the airplane/treadmill argument. (Preemptive response to the inevitable threads arguing about it: you're all wrong on the internet.)