Dame Edna had the perfect way to deal with audience members who left at intermission, and also the ones who'd try to scurry up the aisle during curtain call to beat the crowd to the door.
Because she engaged people in the first five rows in conversation as part of her show, those rows were lit and she could easily see the empty seats (never that many), and would launch into a monologue about how glad she was those sourpusses left. "Oh my, possums, I'm so glad they are gone. They were ruining it for everyone around them with their whining and complaining, weren't they?"
If she noticed someone reading a program instead of watching her, she'd make a point of chastising them, "Oh is our little Broadway show interfering with your reading time? If you're looking to find the plot of this show, there won't be any clue in that old rag. There is no plot," as she'd reach down and insist they give the program to her.
But best was when she'd be taking her bows -- this didn't happen every show, but I went enough times to see it happen often enough -- the music would stop, a single beam of light would focus on someone trying to zip up tha aisle, and most often they would freeze -- like a prisoner caught trying to make an escape -- and Dame Edna would say, "Oh, too bad, dahling, you've left your seat much too quickly. You were going to win the car . . ."
I think that little maneuver probably cured that person from ever trying to beat the crowd again.