Iowa: one of the ones in the middle, right? (I learned this from Buffy) Oddly enough it's wasn't a traditional midnight showing, but a normal evening event a friend spotted near to where she lives. I had to get from seriously east London to well out of London to the west, so probably a couple of hours (bus to railway station, change trains at Waterloo and keep right on going). Camberley (where it was) is a smallish army town, but given it was a Friday night I was disappointed by the lack of sloshed squaddies in drag getting their Rocky on. They'll learn. Also, a lack of drinking took place throughout (at least for the 2 of us) which only shows how very much steam a mother of a 10 year old needs to let off when the chance arrives. She could barely speak the next day. Happily, the ten year old was very curious about the whole thing...in a few more years I'll slip her the DVD; she's still into Mary Poppins at the moment.
And I understand the need to blow off steam. My two are 14 and 17, so they are pretty much at that point where they keep to themselves, but when they were younger? Hoo-boy. You're a good friend to be wiling to educate her daughter like that. 
Totally - when I was still at school I remember hearing Ian McKellan reading the Beaufort Scale (Met Office official scale of wind speeds)- if an actor can make that interesting, what can't he do?
I went to midnight showings at least 20X in 76. At that time we were "lighting up" (mainly dope, some cigs) in the theater and I remember one show where a Fire Marshall came into the theater, walked up onto the stage and told us that "smoking was hazardous" and if we didn't stop they were going to shut down the show. As he was explaining this, a gallon jug of wine rolled down the concrete floors from one of the back rows, under all of the seats and bounced off the stage just as he was finishing... He looked down, glanced up at us and said: "Well, at least it's not on fire". Those were the good'ole days!I recently went to a "Throwback Thursday" screening of this film at my local cinema.
It was very poorly attended.
The few who were in costume attempted a dance to the Timewarp and then gave up, sitting down in silence.
All of the sparse audience were middle aged.
The film came to an end and we all left.
What was it about The Rocky Horror Show that captivated audiences - and was my experience just a one off blip, or is it failing to gain the interest of the younger generations?
Has it had it's day?
And, if so, why?
Been meaning to do that with a few friends for Halloween.
Take it from an original audience participant (I can't even count the number of times I saw this back in the day), go see it in that format. Fun as the film remains seeing it at home, the theater experience brings a whole 'nother dimension to it that has to be seen--and shared in--to be believed.