I remember going to see Patti Lupone in Gypsy, I was only 17 at the time. I went alone as my parents were across the road with my sister at Spamalot.
Got to the interval and in my strong northern English accent asked for a diet coke. He gets the drink, gives it to me and I'm just about to pick it up for a sip and he says a price, can't remember but it was more than I'd expect to pay for just a coke (like $10).
I said - $10 for a coke? To which he replied - no Vodka and coke.
I said, um, I'm only 17.....
He couldn't have taken it away any quicker!