Source: Godzilla vs. Megalon(1973)
Godzilla has one more move that we have to yet talk about. The technique that could potentially wipe out all civilization should he decide to use it. He has so far only used it once, against one foe. The ancient being Megalon is the only monster to warrant Godzilla pulling out all the stops
Against this wonderful and dangerous foe. This blow has a total net force greater than that of the bombs dropped on Hiroshima and Nagasaki. I’m talking about the one, the only, the tail slide. Using this technique, Godzilla slides on his tail as if he's being carried by wires until he plants his feet firmly against his foe and demolishes them.
I probably don’t have to talk about how this breaks every law of Physics that exists, but at the same time this is one of the greatest things I have ever seen. Unless Godzilla has got a set of hydraulics stored up in his tail or butt I don’t see how exactly this should or would ever be possible. This page is mostly a joke, this should be fairly self explanatory for anyone who even witnesses this scene.