I have walked out a few times. Most were Edinburgh Festival Fringe performances. It's lucky dip with them, some are brilliant, but some are just bizarre ego-trips for the performers. However, I have walked out of mainstream theatre performances too, out of sheer boredom. I also walked out of a comedy stand-up night when Andrew Lawrence, who can be funny, sang "I'm going to rape you up the bum", which he described as a revenge for his girlfriend ditching him. Sorry, not funny, although a lot of the male students in the audience found it hilarious apparently 