What did Mr. Greenjeans on the old Captain Kangaroo show say to make the ping pong fall?

Actually it was Mr. Moose who would tell some joke and when the Capt. would say a certain word,Mr. Rabbitt would make the ping pong fall hitting Capt Kangaroo on the head. Most times it was Mr. Moose and Mr. Rabbitt trying to con some carrots out of him.