Over the weekend, Andy Roddick was able to win his third round match against Julien Benneteau and advance in the 2011 US Open.
During the third set, Roddick sat down during a seat change in what he though was his seat.
The seat ended up being Benneteau's and Roddick upon realizing his mistake dropped the "s" word,
(Video is NSFW):
(Courtesy of Larry Brown Sports)