What Was Your Class Song?

In my class it was a tie between John Mayer's "No Such Thing" and "Back That Thang Up" by Juvenile.  In the interest of our parents watching the slide show at graduation that would be accompanied by our class song, we chose the former.  "No Such Thing" still does something to me. I'm 17 again, and I can do anything. Well, except have an explicit rap song as my class song. That I couldn't do. So what about you? I'd like to hear what other "class songs" are out there. And do they take you back to a special time? Or are you so glad you're not 17 anymore?