Oh, God how could I forget this one...
Also in Les Miserables, during "Do You Hear the People Sing", we have our backs to the audience, looking up at Enjolras, who begins the song by standing on the table and singing to us. He's supposed to pull another guy up on the table with him, and then we all join in and gradually turn toward the audience. One night, the guy (my friend John) who is supposed to join Enjolras on the table doesn't get up there successfully. Enjolras puts out his hand and everything, but he doesn't put any effort into pulling John up. The result? John slips down the side of the table, his singing line wavering with the surprise. He tried to keep a straight face, which he did for the most part except for his eyes widening a little. Enjolras and John make a second attempt, and this time it works, but everyone facing the table just looked like they were about to die, their mouth twitching, trying to hold back a smile. We all slowly turn around after John's line singing, "Do you hear the people sing," with these weird expressions on our faces, haha. Oh God, it was hilarious.
Opera is when a guy gets stabbed in the back and, instead of bleeding, he sings.