Ambient noise reduction
I like how on TV people can have quiet, meaningful dialogue in a loud environment like a bar or rock concert. If I could employ the same ambient noise reduction technology used in the television universe, the following dialogue would have never taken place (last night, at Uncle Tony's):
Girl: What do you study?
Girl: No, I asked, "What do you study?"
Me: Yeah, and I said, "Mathematics."
Girl: Why do you keep telling me you're asthmatic?
Me: Yeah, nevermind.