Meanwhile, Oscar's video goes viral because he compares Kevin's voice to the Cookie Monster's, causing Gabe to try to assert his authority in the office.
Upon learning about the engagement, Erin tries to conceal a fit by wrapping her hair around her face, and is silent on the drive back to the office.
During the main party, when Andy starts to play a song he wrote for Erin, she throws cake in his face and reveals her knowledge of his engagement to Angela.
Oscar's video goes viral and is a hit with the staff, and they continuously make fun of Kevin with Cookie Monster impersonations.
But rather than admit his mistake to Pam, Jim, and Dwight, he decides to salvage his pride by saying he will revoke the suspension if they apologize.