Rene Rivera's first Cubs home run means Dillon Maples' first bullpen dance party

Cubs catcher Rene Rivera certainly isn't known for his power. He's only once hit more than 10 home runs in a season and has never hit a grand slam in his Major League career. It wasn't surprising then that, in his two weeks with the Cubs, he had not yet hit a home run. 
That changed in the second inning of Saturday's game against the Braves when Rivera took a curveball from Braves starter Lucas Sims deep to left field with the bases loaded for his first home run as a Cub and his first career grand slam. In the spirit of celebrating newcomers, the Cubs bullpen let September callup Dillon Maples lead their dance party:

While Maples must wait for his first Major League appearance, it is already clear that his unique style of dance has won him fans in the bullpen.