(Dad) I just got an invitation to my thirty year High School class reunion. I don’t think I’m going to attend.

(Son) Dad isn’t it true that each year the graduating class is larger than the year before.

(Dad) Yes, that’s generally how it works. By the time you graduate son the graduation class should be double of what it was last year.

(Son) My point exactly, based on that I really think you should attend.

(Dad) What point?

(Son) I just did the math in my head and it just wouldn’t be fair to the other two graduates if you missed it.