Duller than Dirt?

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Overheard on the web...

I'm just afraid [Republican national convention] might be duller than dirt!

"Ah, well then, that is because you
have not seen my fine dirt. It is anything but dull.
Come over here and let me show it to you."
"So, this is your dirt?"
"Yes. I call this lump 'Claude.'"
"Clod?"
"Yes."