I just got back from watching I am Legend too, I thought it was good, but I didn't really like the ending. I also thought they were gonna show more parts with him just going around and doing whatever he wanted throughout the city.
I know if I were alone in the city like that (well, besides the dark crawlers), I would be driving Ferraris through the streets (that Mustang's cool but a Ferrari would be way funner), busting into videogame stores and taking all the games, getting humongous HDTVs from Best Buy, and all kinds of other cool stuff.
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