Micky, pantomimes aren't silent here in UK. They're musical plays and have certain traditions, such as a 'dame' who is always a man in drag, and a 'principal boy' who is a lady with nice legs dressed as a young man. They portray well-known tales such as Aladdin, Sleeping Beauty, Jack and the Beanstalk and so on.

There's always a slapstick scene with water or custard pies, and a villain, whom everybody hisses and boos.
There are standard responses required from the audience, "He's behind you!" (oh no he isn't) "Oh yes he is!" and so on.

I'll never forget the first time I took my African husband to see a pantomime at Norwich Theatre Royal. He'd never been inside a theatre in his life and was absolutely gobsmacked.

After about half an hour, he leaned over and whispered in French, "I can't think why, but I'm wondering if that fat lady is a man in a dress?" He'd only just twigged! When the evil magician came up from a trap door with lots of 'smoke' he nearly jumped out of his skin.
It was so sweet watching his reactions - he loved every minute.