Agreed. Living just outside of NYC during 9/11, I've seen first hand that it's a pretty good idea to have some kind of 'get home bag/office emergency kit.' A lot of people, especially those who took the train or buses into the city that morning, ended up either being stuck in the city for a few days or being forced to walk home. Cell phones didn't work either, so calling for a ride once you got across the bridge/tunnel was near impossible. Many were forced to walk nearly all the way from NYC to their home in NJ.

It doesn't even have to be some crazy complex and expensive kit either. Some sturdy and comfortable weather-appropriate clothing, water, and simple food items can go a long way. Make sure to toss in some cash in mixed small bills too, especially if you are one of those people who rarely carries/uses cash.