Jack Black [1] showed off many of his impressive talents when he stopped by The Ellen DeGeneres Show on Friday. While discussing his upcoming movie The D Train, Jack told Ellen that he had to learn how to ride a mechanical bull for his role as the head of a high school reunion committee. Jack admitted that he mastered the skill in no time, which prompted Ellen to challenge him to ride a mechanical bull for 45 seconds. For every five seconds he stayed on the bull, Ellen donated $1,000 to Doctors Without Borders working to aid Nepal earthquake victims. Watch the video above to see how long Jack stayed on the bull, then check out Ellen's latest prank [2] on the Today show's Matt Lauer.