Even tiny meteorites cause devastation when they hit earth, so it is remarkable that Hoba West, a iron boulder which weights same as 40 cars didn't even make an impact crater when it landed in Namibia 80,000 years ago. One theory is that the huge flat space rock skipped across Earth's atmosphere like the atmosphere was a vast lake and a stone skipped on its water before settling to the bottom. Imagine that it impacted at just 100km/h while usually meteorites impact at a whopping speed of 3,000km/h.