Funny things about... vacuum toilets?

http://www.vacuumtoiletsaustralia.com.au/faq.html

Q: If you flush while you're sitting on it, will your guts get sucked out?
A: Nah. Just remember to keep your mouth open. Otherwise your head will cave in.

Q: Are vacuum toilets noisy?
A: Only when they gang up and heckle their reckless gravity cousins. [...]

[I think that person needs to get their hearing checked]

http://www.vacuumtoiletsaustralia.com.au/learning-centre.html

The moral of our story is simple: Don't be a Dick. Use a vacuum toilet.