where you are, locationwise, with the music and it sort of became this experience of you are scoring your dreams. so i can fly. so when you are on your skateboard, please don't hurt yourself. >> reporter: the app takes cues from your environment, your speed, direction, time of day, even the sound coming over the microphone, and mixes it with the soundscape of gotham city, so i can kind of put myself in the batmobile and really enjoy the drive home. ♪ now you don't even need to be in the theater to have that "dark knight" experience. i'm david wright in my own version of gotham city. >> david wright is too cool. >> i saw that car, that little beemer. >> interesting nugget, hans.