Answer: His billy club
Mr. Jingles approached Harry, Percy, and Bill during their shift. Harry and Bill were very impressed, but Percy took an immediate dislike to the little mouse. While Harry and Bill were feeding Mr. Jingles, Percy suddenly threw his billy club at him, barely missing. Percy went into a rage trying to kill the mouse, including throwing the trash can on him and trying to step on him, but Mr. Jingles outsmarted Percy and escaped into the restraining room, where he couldn't be found.