A number of people I know have been to see Zizek speak and tell me they enjoyed it, but can't remember anything he said, apart perhaps from one or two joke.
Now I've noticed this isn't just my friends. For example:
Just another false alarm...: "once I'd done trying to work out with my friend Graham what the hell Zizek had been saying in his Amnesty lecture last year, all we actually remembered about it was his comments about chocolate laxatives. And I'm sure we weren't alone in that."
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