Anyway, for more history: http://en.wikipedia.org/wiki/Doolittle_Raid
I've read two (translated) primary source books from Japan written around the time of the raid and it's hard to believe how much this raid freaked them out. It's not excessive to say that it changed the face of the war inside Japan.
Q: "Did you think during the raid that we'd still be talking about it 70 years later"?
Lt. Col. Richard Cole: "You know, I don't think I ever thought about that at the time, it just happened. I think it's very fortunate for one man, me, to still be around talking to you about that after, what is it... 70 years?".
These guys are bad ass.