 Meanwhile, Oscar Martinez (Oscar Nunez) returns to the office from his leave of absence, and Michael wants to celebrate by asking the Party Planning Committee to throw a Mexican-themed fiesta that includes firecrackers, a chihuahua and a donkey.Later, as Jim and Pam continue to call Andy's hidden cell phone, he is pushed over the edge by the combination of Jim and Pam's prank and Michael's rejection of his friendship, and in a fit of rage punches his fist through a wall.When Angela Martin (Angela Kinsey) finally reveals to Michael that she was the cause of Dwight's secret visit to Corporate, Michael realizes his error in forcing Dwight out and goes to Staples to ask him to return to Dunder Mifflin.