Singing along, or even MOUTHING ALONG PASSIONATELY right beside me, emoting and jerking about, is quite possibly the worst.
This always happens to me at Rent. Yes, you know the words. Good for you. You, me and every other Renthead on the planet. The cast doesn't give a crap that you know them, so shut up and sit still.
I also horrified my friend one time by asking an 8 year old girl to stop singing during "Wicked" - I can't help it, my mother never would have allowed me to sing, and I don't want to hear the kid. Her mother seemed embarassed, but it stopped, and that's all I cared about.
I think I'm getting bitter with age.
Now what would you say if today I started over?
Without a thing but this taped together four leaf clover
And I'll pretend like everything is already alright
And I'll run toward the sun till the castle's out of sight