Oh I forgot to mention where I used to work, the toilets were awesome! I'm pretty sure a flush broke the sound barrier. Those things were insanely powerful. In fact I'd test them out. I would poop, not flush, and then wipe until I'm clean. There would be a mountain of toilet paper covering a large turd. I would flush, stand back (they did splash back quite a bit) and watch in amazement as it swallows the whole thing up in one shot. They had like a 1 inch pipe going to them, that's a lot of flow. Pretty sure they had some kind of vacuum system too. Guess being a hospital, they need powerful toilets.
I even wonder if it broke the light barrier. You could probably time travel with those.