Miniature black holes are a possibility. They couldn't form in the normal way. through supernovae explosions, of course, but it's theorized that just after the big bang, the heat and density could have been enough to create black holes of less than stellar masses. Most of these primordial singularities would have been only a few grams in mass and would have long since evaporated away by now, but a few of the larger ones might have survived to the present day and could be drifting around the universe.

If one of these microscopic singularites passed through the Earth at high speeds, there would probably be massive shock explosions at the entrance and exit points. That's what some think the Siberian explosion was. The exit point would have been somewhere in the ocean and thus gone unnoticed in 1908.

It's a longshot theory depending on a lot of unproven assumptions, but it isn't exactly woo-woo stuff like the Tesla thing is.

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...And that, my liege, is how we know the Earth to be banana-shaped. --Sir Bedevere