Who said "I don't believe any of this is happening."?

This quote is attributed to Arthur Dent.

I don't believe any of this is happening. - Arthur Dent

"I don't believe any of this is happening."

Arthur Dent

Character in The Hitchhiker's Guide to the Galaxy

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"This must be Thursday. I never could get the hang of Thursdays."

"Would it save you a lot of time if I just gave up and went mad now?"

"Nobody needs to know that we're here."

"You know how it is with writing. You just do it."