Everybody loves raises, but talking about them (especially with a superior) is a different story. Amongst classmates though, talking about raises can bring up some interesting chatter. Questions like these are good:

How often do you get a raise at your job?

What does it take to get a raise at your job?

What advice do you have for someone who wants a raise?

Do you think raises are important? Why/why not?

Do you deserve a raise? Why/why not?