These unscripted "Glee" moments went off book. Our countdown includes choreography mistakes, musical improv, Copacabana flash mob, and more! What's YOUR favorite unscripted "Glee" moment? Let us know in the comments! #Glee #Unscripted #Improv
18:42
20:50
38:02
12:50
17:11
20:41
17:35
18:50
17:51
70:27
10:05
37:06
18:12
31:17
6:51
7:35
5:36
31:31
24:59
9:51