A guy in Illinois named Bryan Bednarek recently broke the world record for fastest CLAPPER.  He clapped 804 times in one minute.

 

 

It's kind of weird though, because he didn't clap the way you would at a concert.  Instead of keeping one hand basically still, and slapping it with the other, he constantly alternates.  (Search for "Fastest Clapper - 804 in One Minute.")