In Pulitzer Prize-winner David Maraniss' new book, Barack Obama: The Story, we get quite the insight into the president's bullying, pot-smoking past. Money quote:

Barry also had a knack for interceptions. When a joint was making the rounds, he often elbowed his way in, out of turn, shouted "Intercepted!," and took an extra hit. No one seemed to mind.

[buzzfeed]