“I’m thinking of writing my dissertation about the work of David Lewis on modal realism.”

“Arf?”

“His idea is that there are a number of possible worlds, of which this is one. That when something happens, there is another world in which that thing hasn’t happened and events follow through from that.”

“Like in the film ‘Sliding Doors’?  So there’s one world where Gwyneth Paltrow ends up with the chap who played Hugh Grant’s deaf brother in ‘Four Weddings’ and one in which she doesn’t?”  I say.

“John Hannah,” says ActorLaddie.

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