“If I have to hit the brakes, and you’re standing up in the aisle, you’re going to fall, you’re going to hit your head on something… if you’re in the bathroom, good things are not going to happen in there,” he explained.
Article source: https://www.huffingtonpost.co.uk/entry/why-cant-use-loo-before-takeoff_uk_6a26bd5de4b022a41ab34e83