I enjoyed this week's Boston Marathon as a participant from Heartbreak Hill.  It was great seeing an american win for the first time in over 30 years.

The word at this year's Boston Marathon was that security was super tight and would extend to "bandits" running without a bib.

see: http://www.bostonglobe.com/metro/2014/04/12/long-accepted-boston-marathon-bandits-fall-prey-stricter-security/sIuP6HB8xVYI8GChTzzs5H/story.html

But some folks decided they wanted to run so bad, that they created counterfeit bibs, presumably from Facebook pictures of actual runners who excitedly posted their bibs online before the race.  This was discovered when runners searched for their bib post-race and discovered multiple people wearing the same bib number.