Weekly SportsChumpdate: Michael Phelps, Jonathan Sanchez, Lance Armstrong, Brett Favre and more

Michael Phelps recently set the world record for the 100 meter butterfly at the US Swimming National Championships.  On a related note, scientists have now found that marijuana can serve as both a depressant and a stimulant.

In a recent Nike-sponsored pick-up game, LeBron James was allegedly dunked upon by Xavier's Jordan Crawford.  Nike immediately confiscated all video of the event, saying it is against company policy for the media to record such practice sessions.  Similarly, sportschump.net has been caught on video in compromising positions.  Most of these recordings have also been destroyed.  The others can likely be found at the eBay.com bargain bin.