I remember, at age nine or something silly like that, showing my father a diagram full of filled circles and trying to convince him that the indeterminacy of particle collisions was because they had a fourth-dimensional cross-section and they were bumping or failing to bump in the fourth dimension.

Interesting, I came up with a very similar theory when I was a child. Possibly its a fairly obvious connection for people with an abstract understanding of physics but not the mathematics. [I also invented imaginary numbers at one point.]