"Only if it turns out that reality is actually nothing more than a holographic illusion created by the interplay of subatomic particles on a vast two-dimensional membrane."
This article covers a subject that has been deemed non-canon by either the author or the Back to the Future licensees, and thus should not be taken as a part of the "real" Back to the Future universe.
The Auto Infant Cleanser was an invention created by Emmett Brown for automatically bathing his infant son, Jules, in 1888.
In an attempt to fix the machine, Emmett himself is picked up, submerged into the bathtub and cleaned.