That itchy spot in your brain

Today, while walking from class to class I caught this snippet of conversation:

Dude: My nose is metal. My cheeks are metal.
Girl: Metal?
Dude: Titanium.
Girl: What happens when you go to the airport?

And that was it.

Someone had warned me that UCSD students were robots, but I was thinking more along the lines of mindlessly studious rather than actual android.