On saturday, a meteor (or probably just a lump of rock instead of a loosely packed 'snowball') entered the Earth's atmosphere above Perth in Australia. Heating, and finally exploding about 100km above the surface. I have seen a report which claim that it was about basketball sized, and another report that says that it was about the size of half a volkswagen (not completely inconsistant for a lump of rock, but one of these does seem a bit off). Apparently the 'meteor' bits landed in the southern ocean.
It made an impressive show.
Larger impacts are rare, but they do happen. A very large impact is thought to have brought about the last mass extinction.