→ I'm posting for a last time because I'm losing my time. Your theory is that Goombas have soft heads. But if their heads are actually FREAKING HARD? What if Maria was wearing special shoes that was given to him by the Mushroom Kingdom king? Mario's shoes have a special power that chimically reacts with Goombas, making them flat then disappear. Other characters having got those special shoes, so they can't touch Goombas, whose texture burn the crap out of them with acid.