Birthday Distribution

A queer idea intrigued me, a few days ago. If I had a lot of friends, and I start tabulating their birthdays, during the initial stages, it is highly unlikely that two of my friends share the same birthday. However, as the list grows, it becomes more and more likely that at least two people on the list share the same birthday. (It takes only 23 people to be on the list for having more than 50% that at least two people share their birthdays)

This form is just a practical verification of the phenomenon.