The Look Up: Where did I...

I was ecstatic when apps that could tell you what you were listening to came along. Now someone needs to invent something similar, but for actors in shows you're watching. I spend far too much time looking up people through IMDB. That works, but it only goes so far for bit parts.

Aside from lots of people in Doctor Who, I only looked up the phrase "old hat." I was interested in the etymology of the word.