Impact: Earth!

I was reading a few articles about the near earth object passing between us and the moon (98 feet,2014 DX110) and one article referenced Purdue's Impact: Earth! Flash application.  I played around with rocky and iron meteors, slamming them into the ocean and land, and positioning myself various distances from ground zero and checking out the effects like tidal waves, cratering, wind speed, and thermal radiation (where'd my clothes go!?).  That's a fun app for pondering global apocalypse.  Someone should make one for zombies.  Number of plague sites.  Starting city/cities.  Day of the week.  Infection rate.  Zombie speed.