This one is probably an old favorite. I was seeing Legally Blonde in Sacramento (a blue-haired matinee performance) and this lovely old couple was looking at their program during intermission and this was what I heard:
Man: "So, the next show that's comin' here is Spring Awakening. It's a boy meets girl, boy loses girl, boy gets girl back and then they get married at the end. It's supposed to be very fun!"
Woman: "That's not what I heard. I heard they break up in the end. Very sad."
Man: "No, it says right here that it's heartfelt and lovely! Wait..." He leans forward and reads his program. " 'Parental advisory.' Huh. Maybe there's bad language. We should go see this, Maryann."
Woman: "I don't think it's a happy ending. They break up in the end. I don't want to see that. I want something happy, like this."
Man: "This is happy!"
I kindly leaned forward and explained to them that there was sex, homosexuality, masturbation, cursing, suicide and abortion in the show and that the music was freakin' amazing, but the show was not happy. They ended up deciding not to see it.
Into the Woods, Beauty and the Beast, RENT, Mamma Mia!, Dr. Jeckyll and Mr. Hyde, Evita (with Julia Murney), Hairspray (with Paul Vogt), Peter and the Starcatchers (with Christian Borle), Lion King, Altar Boyz, Legally Blonde (with Lauren Zackrin).