Maybe Nobody Will Recognize Me

Pretend you have a really persistent co-worker who goads you into singing with a group for a charitable campaign at work. Then pretend that you, in turn, goad your friends and co-workers into singing with you, effectively cementing your commitment to said group. Pretend you'll be performing in front of people you'll have to see every day.
Pretend that the group decides that "YMCA" by the Village People is an ideal selection.
Complete with costumes and choreography.
Pretend you're doing this tomorrow and you already feel like you're going to hurl.