Was there a reason behind it? There would be no point in asking Zaphod, he never appeared to have a reason for anything he did at all: he had turned … - Douglas Adams

He attacked everything in life with a mix of extraordinary genius and naive incompetence, and it was often difficult to tell which was which.

"No," he said, "look, it's very, very simple ... all I want ... is a cup of tea. You are going to make one for me. Keep quiet and listen." And he sat. He told the Nutri-Matic about India, he told it about China, he told it about Ceylon. He told it about broad leaves drying in the sun. He told it about silver teapots. He told it about summer afternoons on the lawn. He told it about putting in the milk before the tea so it wouldn't get scalded. He even told it (briefly) about the history of the East India Company.
"So that's it, is it?" said the Nutri-Matic when he had finished.
"Yes," said Arthur, "that is what I want."
"You want the taste of dried leaves in boiled water?"
"Er, yes. With milk."
"Squirted out of a cow?"
"Well, in a manner of speaking I suppose ..."

He had got himself a life. Now he had to find a purpose in it.

"The point is, you see," said Ford, "that there is no point in driving yourself mad trying to stop yourself going mad. You might just as well give in and save your sanity for later."