A more fun idea than the sceptic tank, this "ladle on a spring" device that ejects poo from an aeroplane once you flush the toilet. The Jobbie Weecha reportedly "Weechs" the jobbie out so fast it disintegrates-answering queries on why there is no raining shit.
Popularized by Billy Connolly
"Where does your shit go on a plane? A sceptic tank couldn't hold that amount."