A while back someone posted a meteor sim type web experience thing where you were given a map of the world and some settings where you could adjust the size, density, material, speed, angle and impact site of a meteor and then get shown what would happen.

I dropped a Texas sized iron meteor at the max speed it went up to directly on a hotel in the downtown area of my city and got some circles like this. My home was juuuuuust on the outside of them, and I thought "Huh. I guess we'd be fine then."

Nope. That was just the size of the hole it would make. There was a next tab showing the explosion and it basically covered the entire United States, Mexico and most of Canada. lol