So let's say I have an interview and I am asked to bring some samples of code I have worked on. What sorts of code would be ideal for this?

I figure ideally I would want to showcase something relatively concise but complex, perhaps an elegant solution to a fairly complex problem, but what of other considerations? If I am proficient in several languages, would it be advisable to bring samples of more than one, even if I would consider most of my best (most recent) work to be in one language? How big a sample is too big? Other considerations?

I am not really qualified to answer this type of questions but I just had a thought. Shouldn't you bring something that demonstrates skills required for the job you are applying for?