After watching the glitziest pantomime in London, I had a night out at a hilarious 'adult' show. It was a good reminder that you don't need big money to deliver big laughs They call the Palladium Christmas pantomime "the glitziest show in town", which basically means "most expensive". I feel moved to point out that I wasn't paying; I went with my friend, who is a theatre critic. It's anyone's guess which sounds the m…