Dropbox often recruits at my alma mater, they'll always have stacks of free 10gb/15gb space expansion cards (with some redeemable code) to hand out. Big hit with the students.

A few years back, I was supposed to have a sysadmin interview with Dropbox. The guy on the phone said, "Not sure why we're doing this, we already have someone in mind. Sorry for wasting your time. What's your email address?" As soon as I was off the phone, I had an extra 10GB of Dropbox storage for free.

I thought it was mighty classy of him for my time.