Von Trapped is the 10th episode of the eighth season and 180th overall.
Will, Jack, Grace, and Karen all go to The Sound of Music sing-along but things go wrong and they all end up being chased by the theater staff.
The Sound of Music Sing-Along is in town so the friends, clearly fans of the film, dress up and decide to see it. Grace dresses up as Maria von Trapp, Will dresses up as Captain Von Trapp, and Jack dresses up as one of the children.
Will, however accidentally goes to the wrong theater and meets an attractive guy named James. They drink at the bar but Will soon needs to leave. When he finally meets with his friends, Will expresses regret over not ask for James' number because he did not want to seem desperate.
While waiting for Will, Grace gets mistaken for a child care service and is left with seven children to care for, just like Maria von Trapp; and Jack flirts with the usher at the candy counter named Ralph, a reference to Rolfe in the movie.
Before the show starts, Karen throws her empty hip flask over the balcony and hits someone who complains to manager of the theater. Now wanted by the ushers, Karen disguises as a nun and calls herself "Sis. Frances Beaverhausen". As they worry the management is going to press charges, Rosario comes in dressed up as the Mother Abbess and hides them in a closet inside the theater. As they finally make their run, James comes in a second too late and misses Will.