Is that the terms and conditions for using the toilet?
"We reserve all right to enforce arbitration for cases including but not limited to: being sucked into space when you flush, being sucked into space when you use the sink, and any other instances of being sucked into space. Transporter clones may occur if we are actively inverting the tachyon field, and the sink may back up when we are modulating the deflector array."
It's instructions. It's actually from the movie 2001: A Space Odyssey.
Kubrick was a stickler for detail and worked closely with NASA on the movie, so I think that's what they thought it would be like on a commercial passenger spacecraft.
my nine-year-old recently wanted to watch this movie so we all watched it and when we got to the toilet instructions, I could not stop from busting out laughing. so funny!