Pragmatics and the Beetles!
I noticed that the Beetles song I am the Walrus begins with a really good example of personal deixis gone awry!
- I am he is you are he is you are me and we are all together.
If one were to try and follow this train of thought through to an actual conversation, no one would ever be able to tell who was refering to whom. I think that this goes to show us that drugs and pragmatics clearly do not mix.

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