Nick Cannon was at the Knicks game Wednesday to film a promo for "America's Got Talent."  Nick didn't get the reception he counted on.  He was booed...rather badly.

Nick was supposed to make an announcement and then do a trick shot, and then fans were supposed to cheer.  When they refused to cheer after the second take, Nick decided to take a break and talk to the crowd.  He asked them if they got it all out of their system, and then tried it again.  Check out this video to see how that went.