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"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 umbrella necktie is around Neptune's neck

The Umbrella necktie was an invention by Doc Brown. It was an umbrella with a loop around the handle so that it could be worn as a necktie.

In September 1984, Marty McFly found the umbrella necktie around the neck of a statue of Neptune, while searching Doc's garage for something to use in the science project assigned by his teacher at Hill Valley High School, Mrs. Zawadski.