Who said "I've never met anyone who understood the number six"?

This quote is attributed to Ford Prefect.

I've never met anyone who understood the number six - Ford Prefect

"I've never met anyone who understood the number six"

Ford Prefect Humor

Character in The Hitchhiker's Guide to the Galaxy

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"I may be a sorry case, but I don't write jokes in base thirteen."

"You know what they call a Quarter Pounder with Cheese in Paris?"

"The answer is a towel."

"Exactly! Between you, me, and that spoon, it's completely governed by the Government!"

"Never underestimate the power of a good laugh."

"Laughter is the best medicine."

"A good laugh is the best medicine."

"Laughter is contagious and wonderful."