but we do have to worry about 2036…April Friday the 13th.

Apophis has an extremely small impact probability. According to Alene's numbers above… 0,0004%. Yes, you read it right: 0,0004% or 1 in 250,000. Your chance of being killed in a car accident is 1 in 67 or 1,47%. It's far more likely than Apophis' chance of impact with Earth, but it doesn't mean you have to stop driving your car or walking on the street.

(the setting of this game is Earth after Apophis strikes)

Yeah, that one's been on my wishlist for a while.

—

James Michaelis, 99942 Apophis is currently almost certain to miss, and observations over the next few years will probably bring this to certainty. Like Alene says, there are everyday things thousands of times more likely to kill you than an asteroid, and many of those you actually have some control over. And that 1 in 250,000 chance of impact is just that — the chance of impact, not the chance of it killing you. It isn't big enough to cause a global extinction event, only regional damage, and obviously we'd have ample time to get people out of possible target zones. I mean, here we are talking about it more than two decades before closest approach. Focus your energy elsewhere, like staying in shape, eating right and making sure your kids do the same.

http://www.youtube.com/watch?v=0jecDe-rK24&feature=youtube_gdata_player

(the setting of this game is Earth after Apophis strikes)

Compare this to:
Heart disease 25.4%
Cancer 23.2%

Your chance of being murdered is 0.8%. That is 2000 times the chance of Apophis impacting Earth. So, I wouldn't worry about Apophis either.